Errors in Maze Wall in Flash Game

Question

Hi - I put in the codes for the upPressed, downPressed, rightPressed, and leftPressed (to test it) and these are the errors that came up. (these are the errors for the (upPressed) but the other keys are having the same errors.  I put the font in bold text the errors lines starts with.  My goal is to not have the car go through the wall --which it still does.  Could someone please let me know how to fix the errors, thanks.   
Errors:
Scene 1, Layer 'Actions', Frame 1, Line 110
1120: Access of undefined property speed.
Scene 1, Layer 'Actions', Frame 1, Line 110
1120: Access of undefined property i.
Scene 1, Layer 'Actions', Frame 1, Line 110
1120: Access of undefined property i.
Scene 1, Layer 'Actions', Frame 1, Line 114
1120: Access of undefined property wallhitBool.
Scene 1, Layer 'Actions', Frame 1, Line 112
1120: Access of undefined property i.
Scene 1, Layer 'Actions', Frame 1, Line 110
1120: Access of undefined property i.
Here is the program:
import flash.events.KeyboardEvent;
stop();
/* Move with Keyboard Arrows
Allows the specified symbol instance to be moved with the keyboard arrows.
Instructions:
1. To increase or decrease the amount of movement, replace the number 5 below with the number of pixels you want the symbol instance to move with each key press.
Note the number 5 appears four times in the code below.
wallDet1_mc.enabled= false;
wallDet2_mc.enabled= false;
wallDet3_mc.enabled= false;
wallDet4_mc.enabled= false;
wallDet5_mc.enabled= false;
wallDet6_mc.enabled= false;
wallDet7_mc.enabled= false;
wallDet8_mc.enabled= false;
wallDet9_mc.enabled= false;
wallDet10_mc.enabled= false;
var upPressed:Boolean = false;
var downPressed:Boolean = false;
var leftPressed:Boolean = false;
var rightPressed:Boolean = false;
carP_mc.addEventListener(Event.ENTER_FRAME, fl_MoveInDirectionOfKey_3);
stage.addEventListener(KeyboardEvent.KEY_DOWN, fl_SetKeyPressed_3);
stage.addEventListener(KeyboardEvent.KEY_UP, fl_UnsetKeyPressed_3);
stage.addEventListener(Event.ENTER_FRAME, everyFrame);
function fl_MoveInDirectionOfKey_3(event:Event)
    if (upPressed)
        carP_mc.y -= 5;
    if (downPressed)
        carP_mc.y += 5;
    if (leftPressed)
        carP_mc.x -= 5;
    if (rightPressed)
        carP_mc.x += 5;
function fl_SetKeyPressed_3(event:KeyboardEvent):void
    switch (event.keyCode)
        case Keyboard.UP:
            upPressed = true;
            break;
        case Keyboard.DOWN:
            downPressed = true;
            break;
        case Keyboard.LEFT:
            leftPressed = true;
            break;
        case Keyboard.RIGHT:
            rightPressed = true;
            break;
function fl_UnsetKeyPressed_3(event:KeyboardEvent):void
    switch (event.keyCode)
        case Keyboard.UP:
            upPressed = false;
            break;
        case Keyboard.DOWN:
            downPressed = false;
            break;
        case Keyboard.LEFT:
            leftPressed = false;
            break;
        case Keyboard.RIGHT:
            rightPressed = false;
            break;
function everyFrame(event:Event):void {
var mazehit:Boolean = false;
if (upPressed) {
mazehit=false
for(i = 0; i < speed; i++) {
if(carP_mc.hitTestObject(this["wallDet"+i+"_mc"])){
wallhitBool=true;
break;
if(mazehit){
carP_mc.x += 5;
if (downPressed) {
mazehit=false
for(i = 0; i < speed; i++) {
if(carP_mc.hitTestObject(this["wallDet"+i+"_mc"])){
wallhitBool=true;
break;
if(mazehit){
carP_mc.x -= 5;
if (leftPressed) {
mazehit=false
for(i = 0; i < speed; i++) {
if(carP_mc.hitTestObject(this["wallDet"+i+"_mc"])){
wallhitBool=true;
break;
if(mazehit){
carP_mc.x += 5;
if (rightPressed) {
mazehit=false
for(i = 0; i < speed; i++) {
if(carP_mc.hitTestObject(this["wallDet"+i+"_mc"])){
wallhitBool=true;
break;
if(mazehit){
carP_mc.x -= 5;
/**onClipEvent(enterFrame){
    if(this.hitArea(carP_mc._x,carP_mc._y, true)){                   
        carP_mc._x=carP_mc._x;
        carP_mc._y=carP_mc._y;
//Keyboard Listener on stage
//stage.addEventListener(KeyboardEvent.KEY_DOWN, theKeysDown);
//stage.addEventListener(KeyboardEvent.KEY_UP, theKeysUp);
//Makes MazeArt follow the movement of the path_mc
/*addEventListener(Event.ENTER_FRAME, onNewFrame01);
function onNewFrame01(e:Event):void{
    maze_mc.x=wallDet1_mc.x;
    maze_mc.y=wallDet1_mc.y
function Car_P(e:KeyboardEvent):void
    //maze_mc.addEventListener(KeyboardEvent, wallDet1_mc);
    //wallDet1_mc.addEventListener(KeyboardEvent.KEY_DOWN, maze_mc);

Answer 1

After making the revisions.  Here are the latest errors:
TypeError: Error #2007: Parameter hitTestObject must be non-null.
    at flash.display::DisplayObject/_hitTest()
    at flash.display::DisplayObject/hitTestObject()
    at MazeProject4_fla::MainTimeline/everyFrame()
TypeError: Error #2007: Parameter hitTestObject must be non-null.
    at flash.display::DisplayObject/_hitTest()
    at flash.display::DisplayObject/hitTestObject()
    at MazeProject4_fla::MainTimeline/everyFrame()
TypeError: Error #2007: Parameter hitTestObject must be non-null.
    at flash.display::DisplayObject/_hitTest()
    at flash.display::DisplayObject/hitTestObject()
    at MazeProject4_fla::MainTimeline/everyFrame()
revised Program:
import flash.events.KeyboardEvent;
import flash.display.MovieClip;
import flash.events.Event;
stop();
/* Move with Keyboard Arrows
Allows the specified symbol instance to be moved with the keyboard arrows.
Instructions:
1. To increase or decrease the amount of movement, replace the number 5 below with the number of pixels you want the symbol instance to move with each key press.
Note the number 5 appears four times in the code below.
wallDet1_mc.enabled= false;
wallDet2_mc.enabled= false;
wallDet3_mc.enabled= false;
wallDet4_mc.enabled= false;
wallDet5_mc.enabled= false;
wallDet6_mc.enabled= false;
wallDet7_mc.enabled= false;
wallDet8_mc.enabled= false;
wallDet9_mc.enabled= false;
wallDet10_mc.enabled= false;
var speed:Number=5;
var upPressed:Boolean = false;
var downPressed:Boolean = false;
var leftPressed:Boolean = false;
var rightPressed:Boolean = false;
//var i;
var wallhit;
var mazehit;
carP_mc.addEventListener(Event.ENTER_FRAME, fl_MoveInDirectionOfKey_3);
stage.addEventListener(KeyboardEvent.KEY_DOWN, fl_SetKeyPressed_3);
stage.addEventListener(KeyboardEvent.KEY_UP, fl_UnsetKeyPressed_3);
stage.addEventListener(Event.ENTER_FRAME, everyFrame);
function fl_MoveInDirectionOfKey_3(event:Event)
    if (upPressed)
        carP_mc.y -= 5;
    if (downPressed)
        carP_mc.y += 5;
    if (leftPressed)
        carP_mc.x -= 5;
    if (rightPressed)
        carP_mc.x += 5;
function fl_SetKeyPressed_3(event:KeyboardEvent):void
    switch (event.keyCode)
        case Keyboard.UP:
            upPressed = true;
            break;
        case Keyboard.DOWN:
            downPressed = true;
            break;
        case Keyboard.LEFT:
            leftPressed = true;
            break;
        case Keyboard.RIGHT:
            rightPressed = true;
            break;
function fl_UnsetKeyPressed_3(event:KeyboardEvent):void
    switch (event.keyCode)
        case Keyboard.UP:
            upPressed = false;
            break;
        case Keyboard.DOWN:
            downPressed = false;
            break;
        case Keyboard.LEFT:
            leftPressed = false;
            break;
        case Keyboard.RIGHT:
            rightPressed = false;
            break;
function everyFrame(event:Event):void {
var mazehit:Boolean = false;
var wallhit:Boolean = false;
if (upPressed) {
mazehit=true
for(var i:int=0; i < speed; i++) {
if(carP_mc.hitTestObject(this["wallDet"+i+"_mc"])){
wallhit=true
break;
if(mazehit){
carP_mc.x += 5;
if (downPressed) {
mazehit=true
//for(var i:int=0; i < speed; i++) {
if(carP_mc.hitTestObject(this["wallDet"+i+"_mc"])){
wallhit=true
//break;
if(mazehit){
carP_mc.x -= 5;
if (leftPressed) {
mazehit=true
//for(var i:int=0; i < speed; i++)
//for(var i:int=0; i < speed; i++) {
if(carP_mc.hitTestObject(this["wallDet"+i+"_mc"])){
wallhit=true
//break;
if(mazehit){
carP_mc.x += 5;
if (rightPressed) {
mazehit=true
//for(var i:int=0; i < speed; i++)
//for(var i:int=0; i < speed; i++) {
if(carP_mc.hitTestObject(this["wallDet"+i+"_mc"])){
wallhit=true
//break;
if(mazehit){
carP_mc.x -= 5;
/**onClipEvent(enterFrame){
    if(this.hitArea(carP_mc._x,carP_mc._y, true)){                   
        carP_mc._x=carP_mc._x;
        carP_mc._y=carP_mc._y;
//Keyboard Listener on stage
//stage.addEventListener(KeyboardEvent.KEY_DOWN, theKeysDown);
//stage.addEventListener(KeyboardEvent.KEY_UP, theKeysUp);
//Makes MazeArt follow the movement of the path_mc
/*addEventListener(Event.ENTER_FRAME, onNewFrame01);
function onNewFrame01(e:Event):void{
    maze_mc.x=wallDet1_mc.x;
    maze_mc.y=wallDet1_mc.y
function Car_P(e:KeyboardEvent):void
    //maze_mc.addEventListener(KeyboardEvent, wallDet1_mc);
    //wallDet1_mc.addEventListener(KeyboardEvent.KEY_DOWN, maze_mc);