File path search causes NilObjectException

Targets macOS
1

I have a program that I made in Xojo which runs fine on my machines. I want to share it with a work collegue but when I do it will crash with:
“An exception of class:NilObjectException was not handled. The application must shut down.”

It seems to do this very early in its runtime and I have deduced that it’s when the program is searching for some filepaths to some Python modules required to perform some of the tasks of the program e.g. /Library/Frameworks/Python.framework/Versions/3.7/bin/TTX

Is there something about this kind of searching that will make the Mac OS kill the program?
I’m running Mojave, my collegue is running Catalina.

2

If you know the file exists, it might be a permissions issue in Catalina. Give your app full disk access through System Preferences and see what happens.

3

Thank you very much for that suggestion Kem. We have already tried that amongst other security features in the System Prefs.

4

Can you do a remote debug on that machine and trace through the code?

5

Are you sure that /Library/Frameworks/Python.framework/Versions/3.7/bin/TTX exists in that location on 10.15 ?
If it doesnt that might explain the nil object exception

6

Thank you Kem, I’ll have a go at remote debugging.