Why does this code work in one place but not another?

Question

I have a class. Inside the class are two public functions. One calls this:

MovieClip(root)["bmc"+PuzzleGlobals.puzzleAbbrev].addChild(this);

And the other calls this:

 MovieClip(root)["bmc"+PuzzleGlobals.puzzleAbbrev].addChild(fwgame);

fwgame is declared like this (before the addChild):

 var fwgame:FireworkGame = new FireworkGame();

trace (fwgame); //traces correct object

trace (MovieClip(root)["bmc"+PuzzleGlobals.puzzleAbbrev]); //returns a 1009 error

The first line of code works. The second line returns a 1009 error, "Cannot access a property or method of a null object reference."

Why would it be doing that?

kglad · Answer

there are a number of possible causes. use the trace() function to debug:

start debugging by using the following in both functions:

trace(this); // to check if you're still within scope of your class in both.

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