Can not figure out an error message

Question

I made a test file where all elements seem to work. However when I apply the same set up in my real world complex file with other elements, something throws off the code. Here is the error message I have in the output panel. How do I go around testing what causes the problem?

TypeError: Error #1009: Cannot access a property or method of a null object reference.

at acolyte51b_AppsPopUpsThumbs_fla::mainsite_mc_2/frame72()[acolyte51b_AppsPopUpsThumbs_fla.mainsite_mc_2::frame72:206]

at flash.display::MovieClip/gotoAndPlay()

at acolyte51b_AppsPopUpsThumbs_fla::mainsite_mc_2/gotoFrame2()[acolyte51b_AppsPopUpsThumbs_fla.mainsite_mc_2::frame82:350]

line 72:206 refers to this:

holderMovieClip.holderMovieClip_Bckgrnd.visible = false;

(which works in the test version)

and line 82:350 refers to this:

gotoAndPlay("prdctsPopUps");

(this code works, and brings a user to "prdctsPopUps" section, which is frame 72. I guess in is listed in the output panel because this code activates the error, which appears when a user goes to frame 72)

kglad · Accepted Answer

No, I removed all the frames (even thogh they were empty) after frame 72 on the layer which contains holderMovieClip. This way frame 73 starts empty (no frames) on the layer which contains holderMovieClip.

you need a frame 73 in holderMovieClip's layer otherwise, holderMovieClip doesn't exist on frame 73 (when your pageB code executes).

kglad · Answer

holderMovieClip.holderMovieClip_Bckgrnd doesn't exist when line 206 executes.use the trace function to debug.

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