TLF problem with flex_sdk_4.0.0.10485

Hi All,

I have just written a simple As class using flex builder3 and flex_sdk_4.0.0.10485 surprisingly it shows a dozen of errors

     my simple class is

  package {
    import flash.display.Sprite;
   
    import flashx.textLayout.compose.StandardFlowComposer;
    import flashx.textLayout.container.ContainerController;
    import flashx.textLayout.elements.ParagraphElement;
    import flashx.textLayout.elements.SpanElement;
    import flashx.textLayout.elements.TextFlow;

   
    public class HelloWorld extends Sprite
    {
        public function HelloWorld()
        {
            var textFlow:TextFlow = new TextFlow();
            var p:ParagraphElement = new ParagraphElement();
            textFlow.addChild(p);
           
            var span:SpanElement = new SpanElement();
            span.text = "Hello, World";
            span.fontSize = 48;
            p.addChild(span);
           
            textFlow.flowComposer.addController(new ContainerController(this, 400, 200));
            textFlow.flowComposer.updateAllControllers();
        }
    }
}

the error lis in Flex builder:

Severity and Description    Path    Resource    Location    Creation Time    Id
1084: Syntax error: expecting rightbrace before BusyCursor.        DemoTLF    line 17    1267524161015    177
1084: Syntax error: expecting rightbrace before end of program.        DemoTLF    line 53    1267524161015    178
1084: Syntax error: expecting rightparen before s.        DemoTLF    line 17    1267524161000    174
1093: Syntax error.        DemoTLF    line 17    1267524161000    175
1094: Syntax error: A string literal must be terminated before the line break.        DemoTLF    line 17    1267524161015    176

I did'nt get whats going wrong any help would be highly appriceated