Its really hard to know what file cause the error showed in editor, menu, etc.
I suggest using this method :
As you may think its obvious what cause this error (m203), you would be suprised, as this is one of 4 compatibility files.
What about error showing in menu since 1.62 about EVERY content containing weapons or vehicles? Tracking it down is easy as i can alt-tab to logs, but seriosly? How about user that dont know the logs even exist? Its much faster method, and would improve whole error detection.