Trying to put moving text on a stage

Question

Hi This code complains thatI need to import  flash.display.MovieClip, but I have and it dosn't understand addChild.
Very simple code
package code
public class WebPresentation1
  import flash.display.Sprite;
  import flash.text.TextField;
  import flash.text.TextFieldType;
  import flash.text.TextFieldAutoSize;
  import flash.text.TextFormat;
  import flash.display.MovieClip;
  var label:TextField;
  public function WebPresentation1()
   configureLabel();
  function configureLabel():void
   label = new TextField();
   label.autoSize = TextFieldAutoSize.LEFT;
   label.background = true;
   label.border = true;
   addChild(label);
   // I:\presentation2\code\WebPresentation1.as, Line 26 1180: Call to a possibly undefined method addChild.
   // I:\presentation2\code\WebPresentation1.as, Line 1 5000: The class 'code.WebPresentation1' must subclass 'flash.display.MovieClip' since it is linked to a library symbol of that type.
  function setLabel(str:String):void
   label.text = str;
Please help
Desmond.

Answer 1

Should be like this:
package
    import flash.display.MovieClip;
public class WebPresentation1 extends MovieClip
  import flash.display.Sprite;
  import flash.text.TextField;
  import flash.text.TextFieldType;
  import flash.text.TextFieldAutoSize;
  import flash.text.TextFormat;
  import flash.display.MovieClip;
  var label:TextField;
  public function WebPresentation1()
   configureLabel();
  function configureLabel():void
   label = new TextField();
   label.autoSize = TextFieldAutoSize.LEFT;
   label.background = true;
   label.border = true;
   label.text="test";
   addChild(label);
   // I:\presentation2\code\WebPresentation1.as, Line 26 1180: Call to a possibly undefined method addChild.
   // I:\presentation2\code\WebPresentation1.as, Line 1 5000: The class 'code.WebPresentation1' must subclass 'flash.display.MovieClip' since it is linked to a library symbol of that type.
  function setLabel(str:String):void
   label.text = str;