# 1172: Definition flash:system could not be found.!

**URL:** <https://forum.kirupa.com/t/1172-definition-flash-system-could-not-be-found/329170>\
**Category:** Uncategorized\
**Created:** [July 27, 2012, 10:50pm UTC](https://forum.kirupa.com/t/1172-definition-flash-system-could-not-be-found/329170 "2012-07-27T22:50:49Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![rimacy](https://avatars.discourse-cdn.com/v4/letter/r/839c29/32.png) [@rimacy](https://forum.kirupa.com/u/rimacy)\
**Post date:** [July 27, 2012, 10:50pm UTC](https://forum.kirupa.com/t/1172-definition-flash-system-could-not-be-found/329170/1 "2012-07-27T22:50:49Z")

</div>

Hey Guys,

I’m trying to call a video on youtube from a custom class.

Here’s the class:

```auto
package {
    import flash.display.Loader;
    import flash.display.MovieClip;
    import flash.events.Event;
    import flash.net.URLRequest;
    import flash.system;
    import flash.system.Security;
    
    //
    /**
     * ...
     * @author RobMacy
     */
    public class TutorialPlay extends MovieClip 
    {
        
        

        var my_player:Object;
        var my_loader:Loader = new Loader();
        

        public function TutorialPlay():void
        {
            Security.allowDomain("www.youtube.com");
            my_loader.load(new URLRequest("http://www.youtube.com/apiplayer?version=3")); 
            my_loader.contentLoaderInfo.addEventListener(Event.INIT, onLoaderInit);
    
        }
        
        function onLoaderInit(e:Event):void
        {
            addChild(my_loader); 
            my_player = my_loader.content;
            my_player.addEventListener("onReady", onPlayerReady); 
        }
        
        function onPlayerReady(e:Event):void
        {
            my_player.setSize(640, 360);
            my_player.loadVideoById("8BN83gpXc_Q",0);
        } 
    }
    
}

```

Im getting:

“1172: Definition flash:system could not be found” for this line

import flash.system;

the next line

import flash.system.Security;

shows the active colors and I select flash.system from a tree.

What am I doing wrong???