Hallo Eddie, did you ever find a resolution here?
I have the same issue on macOS devices (haven't checked the Windows systems yet), where it appears that deleted scripts are still executing. In my case there are several scripts in the error message, so I wasn't sure if only one failed.
fwiw the directory (on macOS) "/Library/Application Support/AirWatch/Data/Scripts" contains a number of .sh files, which unfortunately seems to be in binary form, with matching plaintext log files showing output for various scripts - so it would seem that scripts are still present on the device, even when unassigned.
regards
Corne