Inflicts Collision Damage error

[LOG] Activated: Inflicts Collision Damage
[ERR] java.lang.StringIndexOutOfBoundsException: String index out of range: -1
[ERR] java.lang.NullPointerException
[ERR] java.lang.NullPointerException
[ERR] java.lang.NullPointerException
[LOG] Unexpected problem on thread Thread-33: null

My game Won't Function!! This is really frustrating, what does this mean!?
I swear I did not remove any block of code from Inflicts Collision Damage!
what is wrong>?

Ok.. I managed to make it work.. I don't know how it happened. I just eliminated the error-ed behavior
then replaced it with new ones.. I ended up deactivating the Inflicts Collision Damage behavior, then used it's Damage block
anyway, I can continue on making my game again.