Question about ERROR - Line Number, UDF File

I have passed my code to another co-worker and he said when he runs the script, he gets an ERROR on line 9544 - the problem, I have only 7100 lines in my script - I was wondering if there is a command/function, that I can put in my script to tell me what UDF file is creating the error?

I am trying to drill it down, but was hoping that there was some indication within the error that would help -

Line 9544 (File "path to exe"):

Error: Variable used without being declared

Edit: ps, I went through my code after adding Opt('MustDeclareVars', 1), and declared all  my variables