List of error messages / codes?

[this-is-rafa]

Does anyone have a list of some of the error messages the API may return to be able to catch them? There are some errors where I have no problem continuing (eg. user does not exist) but anything relating to rate limiting or connection issues I'd like to stop execution. I could very much use the message relating to 'user is private'.

If it's better to go by error codes I'd like to know more also, if someone has any insight.

Any help would be much appreciated.

Here's two I know:

Account with given id does not exist.
Account with given username does not exist.