Improve error messages

[lanthaler]

Error messages like "Documentation: Loading the documentation failed" aren't really helpful.

[databeest]

What causes the "Documentation: Loading the documentation failed"?

[lanthaler]

There are multiple reasons why it might fall. Do you wanna know for for a specific case? In any case, you are right, the error message should be improved

---- databeest wrote ----

What causes the "Documentation: Loading the documentation failed"?

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