Is this text render actor in a separate blueprint from your pawn or player controller? If so, set up a begin play>Enable Input and set the player controller to 0 so you can actually affect it. See if that fixes the error.
Is this text render actor in a separate blueprint from your pawn or player controller? If so, set up a begin play>Enable Input and set the player controller to 0 so you can actually affect it. See if that fixes the error.