try to install theme show error

[amet123]

Traceback (most recent call last):
File "/usr/local/bin/bench", line 11, in
load_entry_point('bench', 'console_scripts', 'bench')()
File "/home/frappe/.bench/bench/cli.py", line 40, in cli
bench_command()
File "/usr/local/lib/python2.7/dist-packages/click/core.py", line 764, in call
return self.main(*args, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/click/core.py", line 717, in main
rv = self.invoke(ctx)
File "/usr/local/lib/python2.7/dist-packages/click/core.py", line 1137, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File "/usr/local/lib/python2.7/dist-packages/click/core.py", line 956, in invoke
return ctx.invoke(self.callback, **ctx.params)
File "/usr/local/lib/python2.7/dist-packages/click/core.py", line 555, in invoke
return callback(*args, **kwargs)
File "/home/frappe/.bench/bench/commands/make.py", line 40, in get_app
get_app(git_url, branch=branch)
File "/home/frappe/.bench/bench/app.py", line 135, in get_app
install_app(app=app_name, bench_path=bench_path, verbose=verbose)
File "/home/frappe/.bench/bench/app.py", line 171, in install_app
find_links=find_links))
File "/home/frappe/.bench/bench/utils.py", line 159, in exec_cmd
raise CommandFailedError(cmd)
bench.utils.CommandFailedError: ./env/bin/pip install -q -e ./apps/bdtheme