You Need To Show The OnPlayerSpawn Code Or Check it Yourself!
I Removed Location,Car,Prop SYstems From GUPS Many Times. I DIdnt Found ANy Errors!!
I Think You Wrongfully Removed One Of Function Os Server That Is Required To Server To Run!!
Open A New GUps And Check FUnctions That Are Related To OnPlayerSpawn
In Both Scripts If Any Difference Then Replace It!!