Just did this in the ThirdPerson Template Project.
Try dragging the pin from your Cast node and manually search the node like this:
If you try to connect the pin to a Bind Event node you already have in your Graph, it will give you the incompatibility message.
I’m not sure, but I think that if you create a Bind Node with nothing attached, it will automatically set its Target class to the class you are in. So if you do it in a Level (like I did), is normal to have an incompatibility error between Actor and Level.