Yop, your scoreholder is NULL i guess. Check it with the “Is Valid” node.
If you have your scoreholder in the scene you can click on it and after you selected it, you can rightclick inside the graph and click on “get reference” or something. I guess it was done like that.
“I’ve created a variable with the type set to the object scoreHolder_C. Then I drag the out pin off to get the “scoreVar” variable.”
So you never set the scoreholder to this variable. It is empty.