Rewrite Error Messages

[XeroOl]

I didn't put a bunch of effort into the error messages, so I think they should all be looked at and potentially rewritten to add more context and guidance. Maybe some should link to the docs. Maybe some should include docs. Maybe some should suggest asking for help in the Discord. I'm not sure what would work best, but I'm sure that what's in the template now has room for improvement.

[XeroOl]

To be clear, this is just about rewriting the strings, not refactoring the code.
The goal is that someone encountering an error should be able to figure out what they need to do to make the error go away, instead of needing to copy paste the error into discord to ask for help

[XeroOl]

• Should not reference LoadCommand