Creating Objects Class

Question

Hey,
I need some help with this code it makes and error when i put it into my project but when its in a blank project it works fine?
code:
package
    import flash.display.MovieClip;
    public class newchars extends MovieClip
        public function newchars()
                        for (var i:int = 0; i < 1; i++)
                var newchar1:MovieClip = new mychar();
                addChild(newchar1);
                newchar1.x = Math.random() * 500;
                newchar1.x = Math.random()*(stage.stageWidth - newchar1.width);
                newchar1.y =  Math.random()*(stage.stageHeight - newchar1.height);
error:
TypeError: Error #1009: Cannot access a property or method of a null object reference.
    at newchars()
    at IceMountain_fla::MainTimeline/frame2()
    at flash.display::MovieClip/gotoAndPlay()
    at IceMountain_fla::MainTimeline/fl_MouseClickHandler_2()
as soon as i click my play button on the start menu it interfieres with my class!
but in a blank project it works fine :S
Class's can make some unusual errors lol
Thanks.

Answer 1

I have been doing your code now this is all the code now please tell me my error it is weird and i cannot work it out
Frame 1:
stop();
Play_1.addEventListener(Event.ENTER_FRAME, fl_MouseClickHandler_2);
function fl_MouseClickHandler_2(event:Event):void
    gotoAndPlay(2);
Frame 2:
stop();
var enemy1:newchars = new newchars();
addEventListener(Event.ENTER_FRAME, fl_EnterFrameHandler);
function fl_EnterFrameHandler(event:Event):void
    Bird_1.x = mouseX;
newchars class:
package
    import flash.display.MovieClip;
    import flash.events.Event;
    public class newchars extends MovieClip
        public function newchars()
            this.addEventListener(Event.ADDED_TO_STAGE, addtostage);
        private function addtostage(e:Event):void
            for (var i:int = 0; i < 10; i++)
                var newchar1:MovieClip = new mychar();
                addChild(newchar1);
                newchar1.x = Math.random()*(stage.stageWidth - newchar1.width);
                newchar1.y = 28.35;
This doesn't have a document class used in settings because i am using add to stage event as you said
Now please look over all the code in my .fla and tell me why i get this error:
Error: Error #2136: The SWF file file:///C|/Users/Brendon%20Battye/Desktop/Ice%20Mountain/Ice%20Mountain.swf contains invalid data.
    at newchars/frame2()
    at flash.display::MovieClip/gotoAndPlay()
    at newchars/fl_MouseClickHandler_2()