Use the Pause on caught exceptions option if you are getting an internal error. Using this exception, you can step through each line of code to find the cause of the failing script. Note there is a pretty point at the bottom of the source file, where you can use this to unminify to simplify debugging.

The following screenshot shows how to turn Pause on caught exceptions on. Find all the scripts that are breaking but getting handled by catch blocks to figure out what's breaking: