A human readable error message for incorrect credentials

[ljleppan]

When a user attempts to return an exercise with incorrect credentials, the resulting error message contains no "human-readable" instructions on what to do, only referring to a HTTP status code 401.

[jamo]

Duplicate of #53

[baobabKoodaa]

I'll do it

[baobabKoodaa]

Unable to reproduce. Can you give more info?

[ljleppan]

Details are a bit unclear as the original error report was quite short. Apparently the flow of events is something similar to the following:

1. Enter valid TMC credential to the plugin
2. Fetch exercises from server
3. Invalidate your credentials. This part is the most unclear. Possibilities for this include:
   1. Edit TMC plugin settings
   2. Change password on TMC server
4. Submit exercises from NetBeans

[baobabKoodaa]

Thanks. Fixed issue.