Internal Server Error

[gotzlotz]

Getting an error when I try to access it through a browser.

{"message":"Internal Server Error","status":"error"}

Here's what the logs say

return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args) # type: ignore[no-any-return]
File "/app/server.py", line 160, in index
return render_template("index.html")
File "/usr/local/lib/python3.9/dist-packages/flask/templating.py", line 150, in render_template
template = app.jinja_env.get_or_select_template(template_name_or_list)
File "/usr/local/lib/python3.9/dist-packages/jinja2/environment.py", line 1087, in get_or_select_template
return self.get_template(template_name_or_list, parent, globals)
File "/usr/local/lib/python3.9/dist-packages/jinja2/environment.py", line 1016, in get_template
return self._load_template(name, globals)
File "/usr/local/lib/python3.9/dist-packages/jinja2/environment.py", line 975, in _load_template
template = self.loader.load(self, name, self.make_globals(globals))
File "/usr/local/lib/python3.9/dist-packages/jinja2/loaders.py", line 126, in load
source, filename, uptodate = self.get_source(environment, name)
File "/usr/local/lib/python3.9/dist-packages/flask/templating.py", line 66, in get_source
return self._get_source_fast(environment, template)
File "/usr/local/lib/python3.9/dist-packages/flask/templating.py", line 100, in _get_source_fast
raise TemplateNotFound(template)
jinja2.exceptions.TemplateNotFound: index.html
Unhandled server error
Traceback (most recent call last):
File "/usr/local/lib/python3.9/dist-packages/flask/app.py", line 917, in full_dispatch_request
rv = self.dispatch_request()
File "/usr/local/lib/python3.9/dist-packages/flask/app.py", line 902, in dispatch_request
return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args) # type: ignore[no-any-return]
File "/app/server.py", line 160, in index
return render_template("index.html")
File "/usr/local/lib/python3.9/dist-packages/flask/templating.py", line 150, in render_template
template = app.jinja_env.get_or_select_template(template_name_or_list)
File "/usr/local/lib/python3.9/dist-packages/jinja2/environment.py", line 1087, in get_or_select_template
return self.get_template(template_name_or_list, parent, globals)
File "/usr/local/lib/python3.9/dist-packages/jinja2/environment.py", line 1016, in get_template
return self._load_template(name, globals)
File "/usr/local/lib/python3.9/dist-packages/jinja2/environment.py", line 975, in _load_template
template = self.loader.load(self, name, self.make_globals(globals))
File "/usr/local/lib/python3.9/dist-packages/jinja2/loaders.py", line 126, in load
source, filename, uptodate = self.get_source(environment, name)
File "/usr/local/lib/python3.9/dist-packages/flask/templating.py", line 66, in get_source
return self._get_source_fast(environment, template)
File "/usr/local/lib/python3.9/dist-packages/flask/templating.py", line 100, in _get_source_fast
raise TemplateNotFound(template)
jinja2.exceptions.TemplateNotFound: index.html
[2026-02-22 00:22:06 +0000] [1] [INFO] Handling signal: term
[2026-02-22 00:22:06 +0000] [10] [INFO] Worker exiting (pid: 10)
[2026-02-22 00:22:06 +0000] [9] [INFO] Worker exiting (pid: 9)
[2026-02-22 00:22:06 +0000] [1] [INFO] Shutting down: Master
[truefan] Starting...
[truefan] Checking for sensors...
[truefan] hwmon devices found.
[truefan] Launching with gunicorn...
[2026-02-22 00:22:07 +0000] [1] [INFO] Starting gunicorn 23.0.0
[2026-02-22 00:22:07 +0000] [1] [INFO] Listening at: http://0.0.0.0:5002 (1)
[2026-02-22 00:22:07 +0000] [1] [INFO] Using worker: sync
[2026-02-22 00:22:07 +0000] [9] [INFO] Booting worker with pid: 9
[2026-02-22 00:22:07 +0000] [10] [INFO] Booting worker with pid: 10
Unhandled server error
Traceback (most recent call last):
File "/usr/local/lib/python3.9/dist-packages/flask/app.py", line 917, in full_dispatch_request
rv = self.dispatch_request()
File "/usr/local/lib/python3.9/dist-packages/flask/app.py", line 902, in dispatch_request
return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args) # type: ignore[no-any-return]
File "/app/server.py", line 160, in index
return render_template("index.html")
File "/usr/local/lib/python3.9/dist-packages/flask/templating.py", line 150, in render_template
template = app.jinja_env.get_or_select_template(template_name_or_list)
File "/usr/local/lib/python3.9/dist-packages/jinja2/environment.py", line 1087, in get_or_select_template
return self.get_template(template_name_or_list, parent, globals)
File "/usr/local/lib/python3.9/dist-packages/jinja2/environment.py", line 1016, in get_template
return self._load_template(name, globals)
File "/usr/local/lib/python3.9/dist-packages/jinja2/environment.py", line 975, in _load_template
template = self.loader.load(self, name, self.make_globals(globals))
File "/usr/local/lib/python3.9/dist-packages/jinja2/loaders.py", line 126, in load
source, filename, uptodate = self.get_source(environment, name)
File "/usr/local/lib/python3.9/dist-packages/flask/templating.py", line 66, in get_source
return self._get_source_fast(environment, template)
File "/usr/local/lib/python3.9/dist-packages/flask/templating.py", line 100, in _get_source_fast
raise TemplateNotFound(template)
jinja2.exceptions.TemplateNotFound: index.html
Unhandled server error
Traceback (most recent call last):
File "/usr/local/lib/python3.9/dist-packages/flask/app.py", line 917, in full_dispatch_request
rv = self.dispatch_request()
File "/usr/local/lib/python3.9/dist-packages/flask/app.py", line 902, in dispatch_request
return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args) # type: ignore[no-any-return]
File "/app/server.py", line 160, in index
return render_template("index.html")
File "/usr/local/lib/python3.9/dist-packages/flask/templating.py", line 150, in render_template
template = app.jinja_env.get_or_select_template(template_name_or_list)
File "/usr/local/lib/python3.9/dist-packages/jinja2/environment.py", line 1087, in get_or_select_template
return self.get_template(template_name_or_list, parent, globals)
File "/usr/local/lib/python3.9/dist-packages/jinja2/environment.py", line 1016, in get_template
return self._load_template(name, globals)
File "/usr/local/lib/python3.9/dist-packages/jinja2/environment.py", line 975, in _load_template
template = self.loader.load(self, name, self.make_globals(globals))
File "/usr/local/lib/python3.9/dist-packages/jinja2/loaders.py", line 126, in load
source, filename, uptodate = self.get_source(environment, name)
File "/usr/local/lib/python3.9/dist-packages/flask/templating.py", line 66, in get_source
return self._get_source_fast(environment, template)
File "/usr/local/lib/python3.9/dist-packages/flask/templating.py", line 100, in _get_source_fast
raise TemplateNotFound(template)
jinja2.exceptions.TemplateNotFound: index.html

[ghmax]

Hi,
btw: thx for this little project!

I just wanna say: i get the same error. truefan starts up and upon loading the web UI i see this template not found error.

truefan-new  | [truefan] Launching with gunicorn...
truefan-new  | [2026-02-22 19:03:10 +0000] [1] [INFO] Starting gunicorn 23.0.0
truefan-new  | [2026-02-22 19:03:10 +0000] [1] [INFO] Listening at: http://0.0.0.0:5002 (1)
truefan-new  | [2026-02-22 19:03:10 +0000] [1] [INFO] Using worker: sync
truefan-new  | [2026-02-22 19:03:10 +0000] [9] [INFO] Booting worker with pid: 9
truefan-new  | [2026-02-22 19:03:10 +0000] [10] [INFO] Booting worker with pid: 10
truefan-new  | Unhandled server error
truefan-new  | Traceback (most recent call last):
truefan-new  |   File "/usr/local/lib/python3.9/dist-packages/flask/app.py", line 917, in full_dispatch_request
truefan-new  |     rv = self.dispatch_request()
truefan-new  |   File "/usr/local/lib/python3.9/dist-packages/flask/app.py", line 902, in dispatch_request
truefan-new  |     return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args)  # type: ignore[no-any-return]
truefan-new  |   File "/app/server.py", line 160, in index
truefan-new  |     return render_template("index.html")
truefan-new  |   File "/usr/local/lib/python3.9/dist-packages/flask/templating.py", line 150, in render_template
truefan-new  |     template = app.jinja_env.get_or_select_template(template_name_or_list)
truefan-new  |   File "/usr/local/lib/python3.9/dist-packages/jinja2/environment.py", line 1087, in get_or_select_template
truefan-new  |     return self.get_template(template_name_or_list, parent, globals)
truefan-new  |   File "/usr/local/lib/python3.9/dist-packages/jinja2/environment.py", line 1016, in get_template
truefan-new  |     return self._load_template(name, globals)
truefan-new  |   File "/usr/local/lib/python3.9/dist-packages/jinja2/environment.py", line 975, in _load_template
truefan-new  |     template = self.loader.load(self, name, self.make_globals(globals))
truefan-new  |   File "/usr/local/lib/python3.9/dist-packages/jinja2/loaders.py", line 126, in load
truefan-new  |     source, filename, uptodate = self.get_source(environment, name)
truefan-new  |   File "/usr/local/lib/python3.9/dist-packages/flask/templating.py", line 66, in get_source
truefan-new  |     return self._get_source_fast(environment, template)
truefan-new  |   File "/usr/local/lib/python3.9/dist-packages/flask/templating.py", line 100, in _get_source_fast
truefan-new  |     raise TemplateNotFound(template)
truefan-new  | jinja2.exceptions.TemplateNotFound: index.html
truefan-new  | [2026-02-22 19:03:52 +0000] [1] [CRITICAL] WORKER TIMEOUT (pid:10)
truefan-new  | [2026-02-22 19:03:52 +0000] [10] [ERROR] Error handling request (no URI read)
truefan-new  | Traceback (most recent call last):
truefan-new  |   File "/usr/local/lib/python3.9/dist-packages/gunicorn/workers/sync.py", line 133, in handle
truefan-new  |     req = next(parser)
truefan-new  |   File "/usr/local/lib/python3.9/dist-packages/gunicorn/http/parser.py", line 41, in __next__
truefan-new  |     self.mesg = self.mesg_class(self.cfg, self.unreader, self.source_addr, self.req_count)
truefan-new  |   File "/usr/local/lib/python3.9/dist-packages/gunicorn/http/message.py", line 259, in __init__
truefan-new  |     super().__init__(cfg, unreader, peer_addr)
truefan-new  |   File "/usr/local/lib/python3.9/dist-packages/gunicorn/http/message.py", line 60, in __init__
truefan-new  |     unused = self.parse(self.unreader)
truefan-new  |   File "/usr/local/lib/python3.9/dist-packages/gunicorn/http/message.py", line 274, in parse
truefan-new  |     line, rbuf = self.read_line(unreader, buf, self.limit_request_line)
truefan-new  |   File "/usr/local/lib/python3.9/dist-packages/gunicorn/http/message.py", line 326, in read_line
truefan-new  |     self.get_data(unreader, buf)
truefan-new  |   File "/usr/local/lib/python3.9/dist-packages/gunicorn/http/message.py", line 262, in get_data
truefan-new  |     data = unreader.read()
truefan-new  |   File "/usr/local/lib/python3.9/dist-packages/gunicorn/http/unreader.py", line 36, in read
truefan-new  |     d = self.chunk()
truefan-new  |   File "/usr/local/lib/python3.9/dist-packages/gunicorn/http/unreader.py", line 63, in chunk
truefan-new  |     return self.sock.recv(self.mxchunk)
truefan-new  |   File "/usr/local/lib/python3.9/dist-packages/gunicorn/workers/base.py", line 204, in handle_abort
truefan-new  |     sys.exit(1)
truefan-new  | SystemExit: 1

[dh4ns3n]

Maybe the index.html is really not present for your local copy
app/templates/index.html

The templates folder contains some files a Windows filesystem for example can not handle (the "eval *" ones).
Maybe the checkout skipped the complete folder?

[idsn]

You need to run it as root 0 0

[gotzlotz]

So just add this to my docker compose?

environment:
- PUID=0
- PGID=0

[ghmax]

Running as root works.

It looks like this running as user 10001 (the default one when no user is given in the compose file):

And when running as root (adding user: 0:0 to the compose file) the template files are accessible:

[gotzlotz]

I'm still getting the same error after running it as root.i set the puid and pgid to 0. Still won't load

[saloid]

Have the same issue on truenas. Version 0.2.0 works fine, but v1.1 gives the server error in browser (both firefox and chrome):
{"message":"Internal Server Error","status":"error"}
I haven't done nothing specific, just allowed port 5002 and tried to pass /sys/class/hwmon or even full /dev - none of them changes nothing
With or without privileged tickbox error is the same

Logs

2026-03-08 20:03:17.297079+00:00[truefan] Starting...
2026-03-08 20:03:17.297098+00:00[truefan] Checking for sensors...
2026-03-08 20:03:17.297106+00:00[truefan] hwmon devices found.
2026-03-08 20:03:17.343170+00:00[truefan] Launching with gunicorn...
2026-03-08 20:03:17.385839+00:00[2026-03-08 22:03:17 +0200] [1] [INFO] Starting gunicorn 23.0.0
2026-03-08 20:03:17.385989+00:00[2026-03-08 22:03:17 +0200] [1] [INFO] Listening at: http://0.0.0.0:5002 (1)
2026-03-08 20:03:17.386004+00:00[2026-03-08 22:03:17 +0200] [1] [INFO] Using worker: sync
2026-03-08 20:03:17.388449+00:00[2026-03-08 22:03:17 +0200] [9] [INFO] Booting worker with pid: 9
2026-03-08 20:03:17.418050+00:00[2026-03-08 22:03:17 +0200] [10] [INFO] Booting worker with pid: 10
2026-03-08 20:03:17.852643+00:00Unhandled server error
2026-03-08 20:03:17.852686+00:00Traceback (most recent call last):
2026-03-08 20:03:17.852696+00:00File "/usr/local/lib/python3.9/dist-packages/flask/app.py", line 917, in full_dispatch_request
2026-03-08 20:03:17.852705+00:00rv = self.dispatch_request()
2026-03-08 20:03:17.852733+00:00File "/usr/local/lib/python3.9/dist-packages/flask/app.py", line 902, in dispatch_request
2026-03-08 20:03:17.852742+00:00return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args)  # type: ignore[no-any-return]
2026-03-08 20:03:17.852750+00:00File "/app/server.py", line 160, in index
2026-03-08 20:03:17.852759+00:00return render_template("index.html")
2026-03-08 20:03:17.852776+00:00File "/usr/local/lib/python3.9/dist-packages/flask/templating.py", line 150, in render_template
2026-03-08 20:03:17.852785+00:00template = app.jinja_env.get_or_select_template(template_name_or_list)
2026-03-08 20:03:17.852793+00:00File "/usr/local/lib/python3.9/dist-packages/jinja2/environment.py", line 1087, in get_or_select_template
2026-03-08 20:03:17.852806+00:00return self.get_template(template_name_or_list, parent, globals)
2026-03-08 20:03:17.852814+00:00File "/usr/local/lib/python3.9/dist-packages/jinja2/environment.py", line 1016, in get_template
2026-03-08 20:03:17.852822+00:00return self._load_template(name, globals)
2026-03-08 20:03:17.852831+00:00File "/usr/local/lib/python3.9/dist-packages/jinja2/environment.py", line 975, in _load_template
2026-03-08 20:03:17.852844+00:00template = self.loader.load(self, name, self.make_globals(globals))
2026-03-08 20:03:17.852852+00:00File "/usr/local/lib/python3.9/dist-packages/jinja2/loaders.py", line 126, in load
2026-03-08 20:03:17.852861+00:00source, filename, uptodate = self.get_source(environment, name)
2026-03-08 20:03:17.852873+00:00File "/usr/local/lib/python3.9/dist-packages/flask/templating.py", line 66, in get_source
2026-03-08 20:03:17.852909+00:00return self._get_source_fast(environment, template)
2026-03-08 20:03:17.852919+00:00File "/usr/local/lib/python3.9/dist-packages/flask/templating.py", line 100, in _get_source_fast
2026-03-08 20:03:17.852934+00:00raise TemplateNotFound(template)
2026-03-08 20:03:17.852944+00:00jinja2.exceptions.TemplateNotFound: index.html
2026-03-08 20:03:18.507962+00:00Unhandled server error
2026-03-08 20:03:18.507979+00:00Traceback (most recent call last):
2026-03-08 20:03:18.507986+00:00File "/usr/local/lib/python3.9/dist-packages/flask/app.py", line 917, in full_dispatch_request
2026-03-08 20:03:18.508001+00:00rv = self.dispatch_request()
2026-03-08 20:03:18.508007+00:00File "/usr/local/lib/python3.9/dist-packages/flask/app.py", line 902, in dispatch_request
2026-03-08 20:03:18.508013+00:00return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args)  # type: ignore[no-any-return]
2026-03-08 20:03:18.508021+00:00File "/app/server.py", line 160, in index
2026-03-08 20:03:18.508027+00:00return render_template("index.html")
2026-03-08 20:03:18.508032+00:00File "/usr/local/lib/python3.9/dist-packages/flask/templating.py", line 150, in render_template
2026-03-08 20:03:18.508038+00:00template = app.jinja_env.get_or_select_template(template_name_or_list)
2026-03-08 20:03:18.508046+00:00File "/usr/local/lib/python3.9/dist-packages/jinja2/environment.py", line 1087, in get_or_select_template
2026-03-08 20:03:18.508052+00:00return self.get_template(template_name_or_list, parent, globals)
2026-03-08 20:03:18.508057+00:00File "/usr/local/lib/python3.9/dist-packages/jinja2/environment.py", line 1016, in get_template
2026-03-08 20:03:18.508066+00:00return self._load_template(name, globals)
2026-03-08 20:03:18.508071+00:00File "/usr/local/lib/python3.9/dist-packages/jinja2/environment.py", line 975, in _load_template
2026-03-08 20:03:18.508077+00:00template = self.loader.load(self, name, self.make_globals(globals))
2026-03-08 20:03:18.508082+00:00File "/usr/local/lib/python3.9/dist-packages/jinja2/loaders.py", line 126, in load
2026-03-08 20:03:18.508093+00:00source, filename, uptodate = self.get_source(environment, name)
2026-03-08 20:03:18.508098+00:00File "/usr/local/lib/python3.9/dist-packages/flask/templating.py", line 66, in get_source
2026-03-08 20:03:18.508104+00:00return self._get_source_fast(environment, template)
2026-03-08 20:03:18.508112+00:00File "/usr/local/lib/python3.9/dist-packages/flask/templating.py", line 100, in _get_source_fast
2026-03-08 20:03:18.508118+00:00raise TemplateNotFound(template)
2026-03-08 20:03:18.508123+00:00jinja2.exceptions.TemplateNotFound: index.html
2026-03-08 20:03:18.987333+00:00Unhandled server error
2026-03-08 20:03:18.987387+00:00Traceback (most recent call last):
2026-03-08 20:03:18.987397+00:00File "/usr/local/lib/python3.9/dist-packages/flask/app.py", line 917, in full_dispatch_request
2026-03-08 20:03:18.987406+00:00rv = self.dispatch_request()
2026-03-08 20:03:18.987414+00:00File "/usr/local/lib/python3.9/dist-packages/flask/app.py", line 902, in dispatch_request
2026-03-08 20:03:18.987428+00:00return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args)  # type: ignore[no-any-return]
2026-03-08 20:03:18.987437+00:00File "/app/server.py", line 160, in index
2026-03-08 20:03:18.987445+00:00return render_template("index.html")
2026-03-08 20:03:18.987454+00:00File "/usr/local/lib/python3.9/dist-packages/flask/templating.py", line 150, in render_template
2026-03-08 20:03:18.987467+00:00template = app.jinja_env.get_or_select_template(template_name_or_list)
2026-03-08 20:03:18.987475+00:00File "/usr/local/lib/python3.9/dist-packages/jinja2/environment.py", line 1087, in get_or_select_template
2026-03-08 20:03:18.987484+00:00return self.get_template(template_name_or_list, parent, globals)
2026-03-08 20:03:18.987496+00:00File "/usr/local/lib/python3.9/dist-packages/jinja2/environment.py", line 1016, in get_template
2026-03-08 20:03:18.987505+00:00return self._load_template(name, globals)
2026-03-08 20:03:18.987513+00:00File "/usr/local/lib/python3.9/dist-packages/jinja2/environment.py", line 975, in _load_template
2026-03-08 20:03:18.987521+00:00template = self.loader.load(self, name, self.make_globals(globals))
2026-03-08 20:03:18.987533+00:00File "/usr/local/lib/python3.9/dist-packages/jinja2/loaders.py", line 126, in load
2026-03-08 20:03:18.987542+00:00source, filename, uptodate = self.get_source(environment, name)
2026-03-08 20:03:18.987550+00:00File "/usr/local/lib/python3.9/dist-packages/flask/templating.py", line 66, in get_source
2026-03-08 20:03:18.987562+00:00return self._get_source_fast(environment, template)
2026-03-08 20:03:18.987571+00:00File "/usr/local/lib/python3.9/dist-packages/flask/templating.py", line 100, in _get_source_fast
2026-03-08 20:03:18.987579+00:00raise TemplateNotFound(template)
2026-03-08 20:03:18.987587+00:00jinja2.exceptions.TemplateNotFound: index.html
2026-03-08 20:03:19.186049+00:00Unhandled server error
2026-03-08 20:03:19.186065+00:00Traceback (most recent call last):
2026-03-08 20:03:19.186071+00:00File "/usr/local/lib/python3.9/dist-packages/flask/app.py", line 917, in full_dispatch_request
2026-03-08 20:03:19.186077+00:00rv = self.dispatch_request()
2026-03-08 20:03:19.186092+00:00File "/usr/local/lib/python3.9/dist-packages/flask/app.py", line 902, in dispatch_request
2026-03-08 20:03:19.186097+00:00return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args)  # type: ignore[no-any-return]
2026-03-08 20:03:19.186103+00:00File "/app/server.py", line 160, in index
2026-03-08 20:03:19.186109+00:00return render_template("index.html")
2026-03-08 20:03:19.186117+00:00File "/usr/local/lib/python3.9/dist-packages/flask/templating.py", line 150, in render_template
2026-03-08 20:03:19.186123+00:00template = app.jinja_env.get_or_select_template(template_name_or_list)
2026-03-08 20:03:19.186128+00:00File "/usr/local/lib/python3.9/dist-packages/jinja2/environment.py", line 1087, in get_or_select_template
2026-03-08 20:03:19.186138+00:00return self.get_template(template_name_or_list, parent, globals)
2026-03-08 20:03:19.186143+00:00File "/usr/local/lib/python3.9/dist-packages/jinja2/environment.py", line 1016, in get_template
2026-03-08 20:03:19.186149+00:00return self._load_template(name, globals)
2026-03-08 20:03:19.186158+00:00File "/usr/local/lib/python3.9/dist-packages/jinja2/environment.py", line 975, in _load_template
2026-03-08 20:03:19.186164+00:00template = self.loader.load(self, name, self.make_globals(globals))
2026-03-08 20:03:19.186169+00:00File "/usr/local/lib/python3.9/dist-packages/jinja2/loaders.py", line 126, in load
2026-03-08 20:03:19.186175+00:00source, filename, uptodate = self.get_source(environment, name)
2026-03-08 20:03:19.186183+00:00File "/usr/local/lib/python3.9/dist-packages/flask/templating.py", line 66, in get_source
2026-03-08 20:03:19.186189+00:00return self._get_source_fast(environment, template)
2026-03-08 20:03:19.186194+00:00File "/usr/local/lib/python3.9/dist-packages/flask/templating.py", line 100, in _get_source_fast
2026-03-08 20:03:19.186202+00:00raise TemplateNotFound(template)
2026-03-08 20:03:19.186208+00:00jinja2.exceptions.TemplateNotFound: index.html
2026-03-08 20:03:19.342664+00:00Unhandled server error
2026-03-08 20:03:19.342686+00:00Traceback (most recent call last):
2026-03-08 20:03:19.342695+00:00File "/usr/local/lib/python3.9/dist-packages/flask/app.py", line 917, in full_dispatch_request
2026-03-08 20:03:19.342717+00:00rv = self.dispatch_request()
2026-03-08 20:03:19.342725+00:00File "/usr/local/lib/python3.9/dist-packages/flask/app.py", line 902, in dispatch_request
2026-03-08 20:03:19.342734+00:00return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args)  # type: ignore[no-any-return]
2026-03-08 20:03:19.342749+00:00File "/app/server.py", line 160, in index
2026-03-08 20:03:19.342757+00:00return render_template("index.html")
2026-03-08 20:03:19.342766+00:00File "/usr/local/lib/python3.9/dist-packages/flask/templating.py", line 150, in render_template
2026-03-08 20:03:19.342774+00:00template = app.jinja_env.get_or_select_template(template_name_or_list)
2026-03-08 20:03:19.342787+00:00File "/usr/local/lib/python3.9/dist-packages/jinja2/environment.py", line 1087, in get_or_select_template
2026-03-08 20:03:19.342795+00:00return self.get_template(template_name_or_list, parent, globals)
2026-03-08 20:03:19.342803+00:00File "/usr/local/lib/python3.9/dist-packages/jinja2/environment.py", line 1016, in get_template
2026-03-08 20:03:19.342816+00:00return self._load_template(name, globals)
2026-03-08 20:03:19.342824+00:00File "/usr/local/lib/python3.9/dist-packages/jinja2/environment.py", line 975, in _load_template
2026-03-08 20:03:19.342833+00:00template = self.loader.load(self, name, self.make_globals(globals))
2026-03-08 20:03:19.342841+00:00File "/usr/local/lib/python3.9/dist-packages/jinja2/loaders.py", line 126, in load
2026-03-08 20:03:19.342862+00:00source, filename, uptodate = self.get_source(environment, name)
2026-03-08 20:03:19.342871+00:00File "/usr/local/lib/python3.9/dist-packages/flask/templating.py", line 66, in get_source
2026-03-08 20:03:19.342880+00:00return self._get_source_fast(environment, template)
2026-03-08 20:03:19.342901+00:00File "/usr/local/lib/python3.9/dist-packages/flask/templating.py", line 100, in _get_source_fast
2026-03-08 20:03:19.342911+00:00raise TemplateNotFound(template)
2026-03-08 20:03:19.342919+00:00jinja2.exceptions.TemplateNotFound: index.html
2026-03-08 20:03:19.525018+00:00Unhandled server error
2026-03-08 20:03:19.525141+00:00Traceback (most recent call last):
2026-03-08 20:03:19.525155+00:00File "/usr/local/lib/python3.9/dist-packages/flask/app.py", line 917, in full_dispatch_request
2026-03-08 20:03:19.525168+00:00rv = self.dispatch_request()
2026-03-08 20:03:19.525180+00:00File "/usr/local/lib/python3.9/dist-packages/flask/app.py", line 902, in dispatch_request
2026-03-08 20:03:19.525209+00:00return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args)  # type: ignore[no-any-return]
2026-03-08 20:03:19.525221+00:00File "/app/server.py", line 160, in index
2026-03-08 20:03:19.525232+00:00return render_template("index.html")
2026-03-08 20:03:19.525244+00:00File "/usr/local/lib/python3.9/dist-packages/flask/templating.py", line 150, in render_template
2026-03-08 20:03:19.525262+00:00template = app.jinja_env.get_or_select_template(template_name_or_list)
2026-03-08 20:03:19.525274+00:00File "/usr/local/lib/python3.9/dist-packages/jinja2/environment.py", line 1087, in get_or_select_template
2026-03-08 20:03:19.525285+00:00return self.get_template(template_name_or_list, parent, globals)
2026-03-08 20:03:19.525301+00:00File "/usr/local/lib/python3.9/dist-packages/jinja2/environment.py", line 1016, in get_template
2026-03-08 20:03:19.525313+00:00return self._load_template(name, globals)
2026-03-08 20:03:19.525324+00:00File "/usr/local/lib/python3.9/dist-packages/jinja2/environment.py", line 975, in _load_template
2026-03-08 20:03:19.525340+00:00template = self.loader.load(self, name, self.make_globals(globals))
2026-03-08 20:03:19.525356+00:00File "/usr/local/lib/python3.9/dist-packages/jinja2/loaders.py", line 126, in load
2026-03-08 20:03:19.525367+00:00source, filename, uptodate = self.get_source(environment, name)
2026-03-08 20:03:19.525378+00:00File "/usr/local/lib/python3.9/dist-packages/flask/templating.py", line 66, in get_source
2026-03-08 20:03:19.525395+00:00return self._get_source_fast(environment, template)
2026-03-08 20:03:19.525406+00:00File "/usr/local/lib/python3.9/dist-packages/flask/templating.py", line 100, in _get_source_fast
2026-03-08 20:03:19.525418+00:00raise TemplateNotFound(template)
2026-03-08 20:03:19.525435+00:00jinja2.exceptions.TemplateNotFound: index.html
2026-03-08 20:03:19.722992+00:00Unhandled server error
2026-03-08 20:03:19.723018+00:00Traceback (most recent call last):
2026-03-08 20:03:19.723029+00:00File "/usr/local/lib/python3.9/dist-packages/flask/app.py", line 917, in full_dispatch_request
2026-03-08 20:03:19.723039+00:00rv = self.dispatch_request()
2026-03-08 20:03:19.723068+00:00File "/usr/local/lib/python3.9/dist-packages/flask/app.py", line 902, in dispatch_request
2026-03-08 20:03:19.723077+00:00return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args)  # type: ignore[no-any-return]
2026-03-08 20:03:19.723086+00:00File "/app/server.py", line 160, in index
2026-03-08 20:03:19.723101+00:00return render_template("index.html")
2026-03-08 20:03:19.723110+00:00File "/usr/local/lib/python3.9/dist-packages/flask/templating.py", line 150, in render_template
2026-03-08 20:03:19.723119+00:00template = app.jinja_env.get_or_select_template(template_name_or_list)
2026-03-08 20:03:19.723128+00:00File "/usr/local/lib/python3.9/dist-packages/jinja2/environment.py", line 1087, in get_or_select_template
2026-03-08 20:03:19.723141+00:00return self.get_template(template_name_or_list, parent, globals)
2026-03-08 20:03:19.723150+00:00File "/usr/local/lib/python3.9/dist-packages/jinja2/environment.py", line 1016, in get_template
2026-03-08 20:03:19.723159+00:00return self._load_template(name, globals)
2026-03-08 20:03:19.723172+00:00File "/usr/local/lib/python3.9/dist-packages/jinja2/environment.py", line 975, in _load_template
2026-03-08 20:03:19.723180+00:00template = self.loader.load(self, name, self.make_globals(globals))
2026-03-08 20:03:19.723189+00:00File "/usr/local/lib/python3.9/dist-packages/jinja2/loaders.py", line 126, in load
2026-03-08 20:03:19.723198+00:00source, filename, uptodate = self.get_source(environment, name)
2026-03-08 20:03:19.723211+00:00File "/usr/local/lib/python3.9/dist-packages/flask/templating.py", line 66, in get_source
2026-03-08 20:03:19.723219+00:00return self._get_source_fast(environment, template)
2026-03-08 20:03:19.723228+00:00File "/usr/local/lib/python3.9/dist-packages/flask/templating.py", line 100, in _get_source_fast
2026-03-08 20:03:19.723241+00:00raise TemplateNotFound(template)
2026-03-08 20:03:19.723250+00:00jinja2.exceptions.TemplateNotFound: index.html

[Xentraxx]

+1
Maybe I'm doing something wrong, but then I think the documentation should be extended if certain devices need to be passed through.

[Eireman]

Also getting the same issue, even with the root environment tags in Compose.

Running TrueNAS 25.10.2.1, DOCKGE.

ADDITION: as “saloid” commented, v0.2.0 works without any problems.

I was hoping for using this tool as I am using a dual socket LGA2011v3 workstation motherboard without integrated IPMI as my server backbone, as i use it for both fast storage for video processing as well as a remote compute source for my LLM work, but have been throttling the Xeons under heavy load because the motherboard UEFI is exceptionally slow in responding to thermal loads and doesn’t ramp up the radiator fans (yes, I watercooled a dual Xeon server, I’m an idiot) until well after the water reaches it’s thermal mass state and the Xeons automatically yank the throttle back. It’s a pain when I have 44 cores running like a hotrod and then all of a sudden my token creation quadruples in time to presentation. I have been setting the fans to full power when my family is out via UEFI, but I have to dial it down when they are home. My wife does not like the entertainment center, upon which the TV sits, sounding like an idling jet, and as I already pulled the SFP cabling, the server lives there forever.

[SeeJayEmm]

So I just tried to spin this up and am having the same issue.
jinja2.exceptions.TemplateNotFound: index.html

I poked my head into the container and the directory permissions are all jacked up:
docker exec -it truefan /bin/bash

truefan@2255ff4ce7b6:/app$ ls -la
total 97
drwxr-xr-x 1 truefan truefan   17 Feb 19 20:33 .
drwxr-xr-x 1 root    root       3 May 21 18:51 ..
-rwxrwx--- 1 truefan truefan 6148 Feb 19 19:26 .DS_Store
drw-r--r-- 1 truefan truefan    9 Feb 19 20:33 __pycache__
-rw-r--r-- 1 truefan truefan 1241 Feb 19 19:39 control.py
-rw-r--r-- 1 truefan truefan 3986 Feb 19 19:47 control_client.py
-rw-r--r-- 1 truefan truefan 4263 Jul 10  2025 cooling-fan-svgrepo-com.svg
-rwxr-xr-x 1 truefan truefan  445 Jul 14  2025 entrypoint.sh
-rw-r--r-- 1 truefan truefan 4038 Feb 19 19:39 fan.py
-rw-r--r-- 1 truefan truefan   13 Jul 11  2025 fan_profile.conf
-rw-r--r-- 1 truefan truefan 5815 Feb 19 19:09 hwmon.py
-rw-r--r-- 1 truefan truefan   58 Jul  5  2025 profiles.json
-rw-r--r-- 1 truefan truefan 3959 Feb 19 20:16 sensors.py
-rw-r--r-- 1 truefan truefan 8702 Feb 19 20:17 server.py
drw-r--r-- 1 truefan truefan    6 Feb 19 20:33 static
-rw-r--r-- 1 truefan truefan 1961 Feb 19 19:58 temperature_sources.py
drw-r--r-- 1 truefan truefan    5 Feb 19 20:33 templates

Note that none of the directories are executable.

A quick find . -type d -exec chmod 0755 {} \; fixed the error.