Can't save graph - error about being linked to private object (which it is not)

Hi. I was following tutorial on 3rd person game and then after having added PowerLevel variable in various spots in the graph (where it was used to GET), I realized that when the time came to set it I didn’t have the setter option. So then I went back to the code and saw that I mistakenly had that one set as BlueprintReadOnly. So ALL I did was change that to BlueprintReadWrite and recompiled. Since then I can’t save the graph to which I have already added the variable in many places. I keep getting

Graph is linked to private object(s) in an external package.
External Object(s):

Try to find the chain of references to that object (may take some time)

The variable is definitely not private, it’s clearly in the public section, and like I said it worked before just fine in many places. Once I changed to BlueprintReadWrite it started failing and even swithcing back to BlueprintReadOnly doesn’t help. The error keeps happening preventing me from saving the work.

Any ideas ? Thanks