Accessing variable from other class returns null

I did a separate levelData class to be able to flexibly add levels. I was happy with it until my supervisor ordered me to convert my levelData into XML. I did an XML version of the levelData's data (question, answers, correct answer...). I used the old class and converted it so that it fetches the XML.

All seems well, I did traces of my answers array and it printed nicely...

But the headache start开发者_如何学JAVAed when I tried this.

// This code appears in a different class with
// currentLvl:LevelData initialized in the constructor.
quizHolder.ansA.ansHud.text = currentLvl.choices[1];
quizHolder.ansB.ansHud.text = currentLvl.choices[2];
quizHolder.ansC.ansHud.text = currentLvl.choices[3];
quizHolder.ansD.ansHud.text = currentLvl.choices[4];
// BTW, I can't make a for loop to do the same function as above. So wierd.

I tried to run it. it returned:

TypeError: Error #2007: Parameter text must be non-null.
    at flash.text::TextField/set text()
    at QuestionPane/setQuiz()
    at QuestionPane/setQuestion()
    at QuestionPane()
    at LearningModule()

Where did I go wrong? I tried making a custom get function for it, only to get the same error. Thanks in advance. If I need to post more of the code, I will gladly do so =)

LevelData Class in PasteBin: http://pastebin.com/aTKC1sBC

Without seeing more of the code it's hard to diagnose, but did you correctly initialize the choices Array before using it? Failing that I think you'll need to post more code.

Another possible issue is the delay in loading the XML data. Make sure your data is set before QuestionPane tries to access it.

When did you call

quizHolder.ansA.ansHud.text = currentLvl.choices[1];
quizHolder.ansB.ansHud.text = currentLvl.choices[2];
quizHolder.ansC.ansHud.text = currentLvl.choices[3];
quizHolder.ansD.ansHud.text = currentLvl.choices[4];

these? You load the XML and on complete you fill the array, what is correct. but is the XML loaded and parsed to the time when you access (fill the TextFields) the choices array already?