Juego flash con fallas

[Julito5D99]

hola cree un juego flash en adobe animate esta bien programadopero me sale esta falla:

TypeError: Error #1009: Cannot access a property or method of a null object reference.
at BrocolioShooterGame_fla::MainTimeline/Loop()[BrocolioShooterGame_fla.MainTimeline::frame128:37]

alguien tien una solucion ? eh intentado de todo eh visto y leido en donde pero solamente me dicen que es erroe d objeto pero no entiendo 😞 ayuda!!!

[kglad]

you're trying to reference something that doesn't exist on frame 128, line 37 of your actionscript. 

if that doesn't make the solution obvious, what is that line of code (along with ~ 10 lines above and ~10 below)?