Battle Test problem -RESOLVED-

Whenever I try to battle test, I get an error message saying, "????? 'Cache' ? 75 ??? TypeError ???????? cannot convert nil into String"

This never happens during the actual game, only when I start a Battletest from the Database. Can someone help with this?

I know what it is. That Battle Background script Synthesize made is the cause. To put it simply, during a battle test, there is no background to load. Oh well. A better alternative to battletesting is placing an event to fight the enemy group.