embedFonts = true; doesen't work

programming flash
1

Hello, txt.embedFonts = true; it doesen’t work, gives me back empty textfield. How to fix this?

package {
    import flash.display.*;
    import flash.text.*;
    import flash.system.*;
    import flash.xml.*
    import flash.events.*
    import flash.utils.*;
    
    //greensock
    import com.greensock.*;
    import com.greensock.plugins.*;
    import com.greensock.easing.*;
    
    
    public class Main extends MovieClip {
        
        private var txt:TextField = new TextField();
        private var txtFormat: TextFormat = new TextFormat( "Verdana", 11, 0x333333);
        
        public function Main() {
        
            //stage
            stage.scaleMode = StageScaleMode.NO_SCALE;
            stage.align = StageAlign.TOP_LEFT;
            System.useCodePage=true;
            
            //textfield
            txt.defaultTextFormat = txtFormat;
            txt.autoSize = TextFieldAutoSize.LEFT;
            txt.antiAliasType = AntiAliasType.ADVANCED;
            txt.gridFitType = GridFitType.SUBPIXEL;
            txt.multiline = true;
            txt.wordWrap = true;
            txt.border = true;
            txt.selectable = true;
            txt.embedFonts = true;
            txt.width = 300;
            txt.height = 200;
            txt.htmlText = "Hello world!";
            addChild(txt);

            //align
            txt.x = stage.stageWidth/2 - txt.width/2;
            txt.y = stage.stageHeight/2 - txt.height/2;
            
        }
    }
}

Thanks