Hey -
Using a function in the source file who’s declaration is commented out in the header file will cause compile errors since the compiler doesn’t know where the declaration of the function is. Additionally, after looking at the function declaration inside Actor.h, that function is not declared virtual so it cannot be overridden in the child class. If you are using a source built version of the engine then this can be edited in the source code, otherwise you will only be able to call the function from your class without changing its functionality.
Cheers