Chapter "Authentication-State" (web-master) - Logging In does not work !

[MarioG8]

Console:
Uncaught (in promise) Error: Network error: Response not successful: Received status code 400
ApolloError ApolloError.js:26
error QueryManager.js:138
notifySubscription Observable.js:140
onNotify Observable.js:179
error Observable.js:240
error observables.js:12
error observables.js:12
notifySubscription Observable.js:140
onNotify Observable.js:179
error Observable.js:240
notifySubscription Observable.js:140
onNotify Observable.js:179
error Observable.js:240
createHttpLink createHttpLink.js:93

Files from project still don't solve the problem.
Best Regards and Have a nice Coding! :)

[MarioG8]

I think I have found the solution of this issue...! :-) I had to take it back a bit to /api/schema.js
I deleted the !"username"! from type Mutation - signIn
This seemed logical because we do not have such a field in signin.js file in
web/solutions/04-Authentication-State/pages/signin.js /
GraphQL requires you to be explicit about specifying which fields you would like returned from your query. Am I right?
Now everything works great so far ...I can log in and log out and application does not break :)
I wanted to make a "pull request" but I'm ashamed ... Please analyse my code and grant permission for a "pull request" if everything works fine...?!?
See You Soon and Have a nice Day or Night whatever you want;)