The enum that is specified in the input XML file does not exist in Microsoft Dynamics AX

This is an error you might experience while trying to generate proxies for EP. This can be caused by having a table field setup with an enum that does not exist.

System enums, i.e. enums not in AOT / Data Dictionary / Enums, seems to be falling in the category if enums that "doesn't exists".

You can read a bit more about the issue here.

The error message it self doesn't reveal much information, so the fastest way to find the culprit seems to be to run a Best Practice Check for all your tables. The Best Practice Check will report the issue.