New to gaming intro AS3 class


how are ya? i am having a problem moving from one level to the next. I have included a link to the game. the problem is when you finish level one, when it goes to level 2, I get an error and it will not let the button click me over.

thank you!!!


P.S. this is the error:
TypeError: Error #1009: Cannot access a property or method of a null object reference.
at project4_v3_fla::MainTimeline/frame2()