Tg Script: Getting Error

Hi MS Users,

I have some problems to run the Tg script by Stephen (Automate calculations for estimating glass transition temperature in polymers). When I try to run the script, I get the following error: "There are no objects in the "SymmetrySystems" collection (function/property "SymmetrySystem") at -e line 480."

Could anyone please help with this error.

Thanks in advance.