Better error handling

[votti]

Currently, the error capturing is implemented to catch all errors and notify the user that an error happened, but the actual error is not displayed, which makes it difficult to debug user errors.

Adding a proper error logging mechanism would be helpful.

[jwindhager]

Shall we close this (not sure its relevant anymore)? @nilseling

[nilseling]

Looking at #120 I think we should keep this open. Maybe something that @Milad4849 could take on?

[Milad4849]

Sure I can take on #120

[jwindhager]

I don't think this is related to #120

[nilseling]

Something a bit informative than Key Error: 'full' would be nice though.