TypeError: Error #2007: Parameter child must be non-null.
at flash.display::DisplayObjectContainer/addChildAt()
at fl.controls::BaseButton/fl.controls:BaseButton::drawBackground()
at fl.controls::BaseButton/fl.controls:BaseButton::draw()
at fl.core::UIComponent/drawNow()
at fl.controls::ScrollBar/fl.controls:ScrollBar::draw()
at fl.controls::UIScrollBar/fl.controls:UIScrollBar::draw()
at fl.core::UIComponent/::callLaterDispatcher()
TypeError: Error #2007: Parameter child must be non-null.
at flash.display::DisplayObjectContainer/addChildAt()
at fl.controls::BaseButton/fl.controls:BaseButton::drawBackground()
at fl.controls::BaseButton/fl.controls:BaseButton::draw()
at fl.core::UIComponent/::callLaterDispatcher()
TypeError: Error #2007: Parameter child must be non-null.
at flash.display::DisplayObjectContainer/addChildAt()
at fl.controls::BaseButton/fl.controls:BaseButton::drawBackground()
at fl.controls::LabelButton/fl.controls:LabelButton::draw()
at fl.core::UIComponent/::callLaterDispatcher()
TypeError: Error #2007: Parameter child must be non-null.
at flash.display::DisplayObjectContainer/addChildAt()
at fl.controls::BaseButton/fl.controls:BaseButton::drawBackground()
at fl.controls::BaseButton/fl.controls:BaseButton::draw()
at fl.core::UIComponent/::callLaterDispatcher()
TypeError: Error #2007: Parameter child must be non-null.
at flash.display::DisplayObjectContainer/addChildAt()
at fl.controls::BaseButton/fl.controls:BaseButton::drawBackground()
at fl.controls::BaseButton/fl.controls:BaseButton::draw()
at fl.core::UIComponent/::callLaterDispatcher()

Clearly, it’s the component that’s causing it. Is there a particular way in which the component needs to be addressed in the codes? I’m using this to load text dynamically:

import fl.controls.UIScrollBar;

var my_sb:UIScrollBar = new UIScrollBar();
my_sb.x = my_txt.x + my_txt.width;
my_sb.y = my_txt.y;
my_sb.height = my_txt.height;
my_sb.scrollTarget = my_txt;
addChild(my_sb);

function loadMyText():void {
var url:String = “assets/text/testHTML.txt”;
var loadIt:URLLoader = new URLLoader();
loadIt.addEventListener(Event.COMPLETE, textCompleteHandler);
loadIt.load(new URLRequest(url));
}

function textCompleteHandler(event:Event):void {
var urlV:URLVariables = new URLVariables(event.currentTarget.data);
//my_txt.condenseWhite = true;
my_txt.htmlText = urlV.content as String;
my_txt.styleSheet = myStyleSheet;
}

var flash_css:URLLoader = new URLLoader();
flash_css.addEventListener(Event.COMPLETE, cssCompleteHandler);
flash_css.load(new URLRequest(”assets/text/brWht.css”));

var myStyleSheet:StyleSheet;

function cssCompleteHandler(event:Event):void {
myStyleSheet = new StyleSheet();
myStyleSheet.parseCSS(event.currentTarget.data);
my_txt.styleSheet = myStyleSheet;
loadMyText();
}

I can’t seem to find the answer anywhere. Can you help?
TIA.