error 1067: Implicit coercion of a value of type flash.display:Movieclip to an unrelated type of cla

Hello,

i'm building a shooting game in as3 and i'm having trouble in making the cursor hit the creatures..

that's my code:

import flash.display.MovieClip;

import flash.events.TimerEvent;

import flash.events.Event;

import flash.events.MouseEvent;

          Mouse.hide();

var notequals:Timer = new Timer(1500, 1);

            notequals.addEventListener(TimerEvent.TIMER,enterdmuiot); 

addEventListener(Event.ENTER_FRAME, fl_EnterFrameHandler_5);

function fl_EnterFrameHandler_5(event:Event):void

{

          notequals.start( );

          my_cursor.x=mouseX;

          my_cursor.y=mouseY;

}

function enterdmuiot(event:TimerEvent):void{

var dmuiot:Array = [dmutjump, dmutskate, dmutwalk, dmutonrope];

var myname:Array=["dmutjump", "dmutskate", "dmutwalk", "dmutonrope"];

for (var i:Number = 0; i<1; i++)

{

          var myRnd:Number = int (Math.random()*dmuiot.length);

          var dmut:MovieClip = new dmuiot[myRnd];

          dmut.name = myname[myRnd];

          addChild(dmut);

          trace(dmut);

}

          stage.addEventListener(MouseEvent.CLICK, dmutclick);

function dmutclick(e:MouseEvent):void

{

          if (e.target is dmut){

                    e.target.parent.removeChild(e.target);

          }

}

}

I always get error 1067:(

can someone help me with it?