I have an illegible sentence instead of a legible one when I test the movie

How do I do this? :

Output: Fonts should be embedded for any text that may be edited at runtime, other than text with the "Use Device Fonts" setting. Use the Text > Font Embedding command to embed fonts.

My code where it says "I am thinking of a number between 1 and 100" shows patchyly.  So you can't read it as only a few letters are there:

package

{

          import flash.display.MovieClip;

          import flash.events.MouseEvent;

          public class Main extends MovieClip

          {

                    var startMessage:String;

                    var mysteryNumber:uint;

                    public function Main()

                    {

                              init();

                    }

                    function init():void

                    {

                              //Initialize variables

                              startMessage ="I am thinking of a number between 1 and 100";

                              mysteryNumber = 50;

                              //Initialize text fields

                              output_txt.text = startMessage;

                              input_txt.text = "";

                              input_txt.backgroundColor = 0xCCCCCC;

                              input_txt.restrict = "0-9";

                              stage.focus = input_txt;

                    }

          }

}