Pac control groov rio io error

[Beno]

See my reply to this error that was asked yesterday morning:

Encountered an Improper Argument

Greetings, when I tried to create a new numeric variable, I will get an error message ’ Encountered an Improper Argument’ pop out’ in pac control. However, the variable still can be created and doesn’t now effect the running program currently. May I know the reason for the error message coming out and does any solution to avoid it? The program used is pac control professional version r10.3d. Thanks in advance.