Hi Scott,
That would indicate that the Windows Process is returning a result code of 2. 0 should be returned to indicate no error.
What result code does your Python.exe return?
Do you know if your program is even being executed?
KMotionCNC launches the process as a hidden application and waits for it to complete. If you don't want your application to be hidden you can spawn it from a batch file with the "Start" command. ie
Start MyPythonProgram.exe
You might also test something simple like launching notepad.exe to see if that works correctly (note it will be hidden if not launched with the Start command).
HTH
Regards
TK