Version 15.3: I got an error E0304: "UPawnSensingComponent::FSeePawnDeligate::_Intertnal_AddDynamic" matches the argument list

I was working on c++ behavior tree. When tried to add the following line:
PawnSensingComp->OnSeePawn.AddDynamic(this, &AEnemyCharacter::OnPlayerCaught);
I got the error shown in the picture. ANy help?