Fix an error in an auction script

This is actually not for me but I am trying to find someone to help a friend of mine. He is running an Everysoft auction script and keeps getting the error "The item number may not contain any non-numeric characters." His items post in the gallery but when you click on the categories this is what happens. I am almost sure this error was caused when he moved the script from one server to another. That is basically it. This seems to be a fairly common error with these scripts and I'm sure someone knows how to fix this. Please let me know if you do and provide an estimate for the work. Thanks!