I was looking over this and noticed on your add node that you have a pass by ref pin. Try recreating the add node without any pass by ref and see if that solves the error. In this function, the pass by ref is unnecessary and should not be there.
I was looking over this and noticed on your add node that you have a pass by ref pin. Try recreating the add node without any pass by ref and see if that solves the error. In this function, the pass by ref is unnecessary and should not be there.