Clarification of error message - GM?

[Skye]

Hi,

I've been making changes to my game and testing on the computer I use to make the game have been fine. I sent the changes out to the beta testers and they are experiencing multiple errors on every screen. I installed the game on a backup computer we have, applied the changes and errors everywhere!!!

The error popups are : error executing script . . .

then the message about global variables and reserved variables for Adventure Maker

the last line indicates that the error is:

"Invalid Number"

Can someone shed some light on what sort of problem might be causing an "Invalid Number" error? I gather there is something amiss with the variables but I be darned if I can understand why on one computer it works perfectly and on the other its a mess.

thanks,
Skye