It occurred to me that if something went wrong while loading a mod, that the user would get a Game Maker generated error. While this would give them an idea of what went wrong, it does not provide an origin of the issue or what specifically lead to the error.
I set up a file logging system so allow the game to parse information to a file that can be read in real time. It can detect corruptions throughout the loading process (not every possible mistake but most).
You can see in the image above, "Corrupt file prefix: SomeBrokenFile.txt". The error is referring to this file...
Obviously "SomeBrokenFile.txt" was not given a prefix and so the program doesn't know what type of mod file it is. The file is ignored the error is passed to the log file to hopefully help the user see the problem.