Why: You're binding a function to an Event Dispatcher (Delegate), but the function's parameters don't match the dispatcher's expected signature '{expected}'. You passed '{got}'.

Fix: Either: (a) change your function's input parameter types to match the dispatcher (open the function → My Blueprint → Inputs section → match types one-by-one), or (b) bind a DIFFERENT function whose signature already matches. The Details panel of the Bind Event node shows the expected signature.