Error #1067 problem

Question

Hi,
I am new to flash and trying to do a simple game but I ran across this problem
1067: Implicit coercion of a value of type Array to an unrelated type flash.display:MovieClip.
I am not sure what is going on but here is my code for Player.as
package {
     import flash.display.MovieClip;
     import flash.events.Event;
     import flash.events.KeyboardEvent;
     import flash.ui.Keyboard;
     public class Player extends MovieClip {
          public var speed:int=30;
          public var theWall:MovieClip;
          public function Player() {
               addEventListener(Event.ADDED_TO_STAGE,init);
          private function init(e:Event):void {
               removeEventListener(Event.ADDED_TO_STAGE,init);
               stage.addEventListener(KeyboardEvent.KEY_DOWN, keyHit);
               addEventListener(Event.ENTER_FRAME,testHit); //same as this.addEv.....'this' being object Player
          private function keyHit(event:KeyboardEvent):void {
               switch (event.keyCode) {
                    case Keyboard.RIGHT :
                         x+=speed;
                         break;
                    case Keyboard.LEFT :
                         x-=speed;
                         break;
                    case Keyboard.UP :
                         y-=speed;
                         break;
                    case Keyboard.DOWN :
                         y+=speed;
                         break;
                    default :
                         break;
          private function testHit(e:Event):void {
               for (var i:int,j:int = theWall.length; i < j; i++) {
                    if (hitTestObject(theWall[i])) { //same as this.hitTestObject(aWall),'this' being object Player
                         x-=speed; //same as this.x -= this.speed
and here is the code in action panel
var player1:Player = new Player();
addChild(player1);
player1.x = 344;
player1.y = 219;
var walls:Array = [wall1,wall2,wall3,wall4];
player1.theWall = walls;
Hope someone can help me...

Answer 1

Chances are the issue lies between declaring...
public var theWall:MovieClip;
and the usage...
for (var i:int,j:int = theWall.length; i < j; i++) {
         if (hitTestObject(theWall[i])) {