Strange Error When Setting Button to GoTo Next Frame

i using cs5/as3- have 1 scene 2 frames. first frame has submit button plays movieclip held in second frame.

 

i want able press button @ end of movie take me first frame of main timeline

 

in second last frame of movieclip, have stop , button want take next frame. in next frame have set go root. working correctly. however, need button on click go last frame of movie clip , erroring out.

 

i have code on button:

 

stop();

kite_btn.addeventlistener(mouseevent.click, function(evt:mouseevent):void{

    nextframe();    

});

 

this error getting:

typeerror: error #1009: cannot access property or method of null object reference.

          at kite_fla::kite_3/frame192()

 

i have looked everywhere , code repeated , confirmed correct...but error still there.

 

thanks in advance

in 3rd sentence mention button @ end of movie.  it's not clear mean "movie".

 

is movieclip?  main timeline? 

 

and button?  in movieclip?  on main timeline?

 

and showed code.  code?  in movieclip?  on main timeline?  , code on frame 192?

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