Compile throws a “User-defined type not defined” error but does not go to the offending line of code

Question

Symptoms

This is a symptom specifically when compiling an Excel VBA project. The following error occurs:

User-defined type not defin

Answer 1

Had a similiar experience, but it was because I had renamed an enum in one of my classes. I exported and re-imported the Classes that had referred to the old enum and the error message disappeared. This suggests it is a caching issue in the VBA environment.