ActionScript Problem In Email Form

Hi Everyone I Am Having Problems With actionscript and php it is basicly and email form with many comboboxes

I am Recieving This Error:

TypeError: Error #1009: Cannot access a property or method of a null object reference.
at fl.controls::ComboBox/get value()
at Untitled_fla::wholeFrom_1/ValidateAndSend()

here is the code :
Actionscript :

function Addprocessor ():void {
processor.addItem( { label: "Intel® Core™ 2 Duo" } );    
processor.addItem( { label: "Intel® Core™ 2 Quad" } );    
processor.addItem( { label: "Intel® Core™ i3" } );    
processor.addItem( { label: "Intel® Core™ i5" } );    
processor.addItem( { label: "Intel® Core™ i7" } );
processor.addItem( { label: "Intel® Core™ i7 Extreme Editon" } );
}
// Run function above now
Addprocessor ();  


function Addramsize ():void {
ram_size.addItem( { label: "1 GB" } );    
ram_size.addItem( { label: "2 GB" } );    
ram_size.addItem( { label: "4 GB" } );    
ram_size.addItem( { label: "6 GB" } );    
ram_size.addItem( { label: "8 GB" } );
ram_size.addItem( { label: "12 GB" } );
}
// Run function above now
Addramsize ();  


function Addmoniter ():void {
moniter.addItem( { label: "15 Inch" } );    
moniter.addItem( { label: "17 Inch" } );    
moniter.addItem( { label: "19 Inch" } );    
moniter.addItem( { label: "21 Inch" } );    
}
// Run function above now
Addmoniter ();


function Addvideocard ():void {
videocard.addItem( { label: "NVIDIA GeForce GTS 240" } );    
videocard.addItem( { label: "NVIDIA GeForce 310" } );    
videocard.addItem( { label: "NVIDIA GeForce 205" } );    
videocard.addItem( { label: "NVIDIA GeForce GT 320" } );    
videocard.addItem( { label: "NVIDIA GeForce GT 330" } );
videocard.addItem( { label: "NVIDIA GeForce GT 340" } );
videocard.addItem( { label: "NVIDIA GeForce GTS 240" } );    
videocard.addItem( { label: "NVIDIA GeForce GTX 590" } );    
videocard.addItem( { label: "NVIDIA GeForce GTX 580" } );    
videocard.addItem( { label: "NVIDIA GeForce GTX 570" } );    
videocard.addItem( { label: "NVIDIA GeForce GTX 560" } );
videocard.addItem( { label: "NVIDIA GeForce GTX 550" } );
videocard.addItem( { label: "NVIDIA GeForce GTX 460" } );    
videocard.addItem( { label: "ATI Radeon™ HD 5000 Series " } );    
videocard.addItem( { label: "ATI Radeon™ HD 4000 Series graphics" } );    
videocard.addItem( { label: "AMD Radeon™ HD 6990 Graphics" } );    
videocard.addItem( { label: "AMD Radeon™ HD 6000 series " } );
}
// Run function above now
Addvideocard ();  


function Addcabinet ():void {
cabinet.addItem( { label: "Zebronics® Pluto" } );    
cabinet.addItem( { label: "Zebronics® Genie" } );    
cabinet.addItem( { label: "Zebronics® Genesis" } );    
cabinet.addItem( { label: "Zebronics® Flair" } );    
cabinet.addItem( { label: "Zebronics® Eternity" } );
cabinet.addItem( { label: "Zebronics® Fantasy" } );
cabinet.addItem( { label: "Zebronics® Home" } );
cabinet.addItem( { label: "NZXT® LEXA S" } );
cabinet.addItem( { label: "NZXT® Phantom" } );    
cabinet.addItem( { label: "NZXT®  Guardian 921 RB" } );    
cabinet.addItem( { label: "Coolermaster® Elite 310" } );    
cabinet.addItem( { label: "Coolermaster® HAF X" } );    
cabinet.addItem( { label: "Coolermaster® HAF X NVIDIA edition " } );    
cabinet.addItem( { label: "Coolermaster® HAF 932 AMD " } );    
cabinet.addItem( { label: "Coolermaster® HAF HAF 922 " } );    
}
// Run function above now
Addcabinet ();  


function Addram ():void {
ram_company.addItem( { label: "Kingston" } );    
ram_company.addItem( { label: "Cosair" } );    
}
// Run function above now
Addram ();  


function Addprocessor2 ():void {
processor_2.addItem( { label: "1.8 GHz" } );
processor_2.addItem( { label: "2.00 GHz" } );
processor_2.addItem( { label: "2.13 GHz" } );
processor_2.addItem( { label: "2.20 GHz" } );
processor_2.addItem( { label: "2.33 GHz" } );
processor_2.addItem( { label: "2.40 GHz" } );
processor_2.addItem( { label: "2.50 GHz" } );    
processor_2.addItem( { label: "2.66 GHz" } );    
processor_2.addItem( { label: "2.83 GHz" } );    
processor_2.addItem( { label: "2.93 GHz" } );
processor_2.addItem( { label: "3.00 GHz" } );
processor_2.addItem( { label: "3.00 GHz" } );
processor_2.addItem( { label: "3.06 GHz" } );
processor_2.addItem( { label: "3.20 GHz" } );
processor_2.addItem( { label: "3.33 GHz" } );
processor_2.addItem( { label: "3.46 GHz" } );
}
// Run function above now
Addprocessor ();  


function Addharddisk ():void {
harddisk.addItem( { label: "60 GB" } );
harddisk.addItem( { label: "120 GB" } );    
harddisk.addItem( { label: "250 GB" } );    
harddisk.addItem( { label: "500 GB" } );    
harddisk.addItem( { label: "750 GB" } );
harddisk.addItem( { label: "1 TB" } );
harddisk.addItem( { label: "1.5 TB" } );
harddisk.addItem( { label: "2 TB" } );
}
// Run function above now
Addharddisk ();  


function Addharddisktype ():void {
harddisk_type.addItem( { label: "SSD" } );
harddisk_type.addItem( { label: "HDD" } );    
}
// Run function above now
Addharddisktype ();  


// build variable name for the URL Variables loader
var variables:URLVariables = new URLVariables;


// Build the varSend variable
var varSend:URLRequest = new URLRequest("email.php");
varSend.method = URLRequestMethod.POST;
varSend.data = variables;


// Build the varLoader variable
var varLoader:URLLoader = new URLLoader;
varLoader.dataFormat = URLLoaderDataFormat.VARIABLES;
varLoader.addEventListener(Event.COMPLETE, completeHandler);


// handler for the PHP script completion and return of status
function completeHandler(event:Event):void {
    name_txt.text = "";
    email_txt.text = "";
    phone_txt.text = "";
    numberofpcs.value = 1;
    
    status_txt.text = event.target.data.return_msg;
}


buynow_btn.addEventListener(MouseEvent.CLICK, ValidateAndSend);


function ValidateAndSend (event:MouseEvent):void {
    
    // validate fields
    if(!name_txt.length) {
        status_txt.text = "Please enter your name";
    } else if (!email_txt.length) {
        status_txt.text = "Please enter your email";
    } else if (!phone_txt.length) {
        status_txt.text = "Please enter your Phone Number";
    } else {


        variables.userName = name_txt.text;
        variables.userEmail = email_txt.text;        
        variables.userPhone = phone_txt.text;
        variables.userProcessor = processor.value;
        variables.userProcessortype = processor_2.value;
        variables.userharddisk = harddisk.value;
        variables.userVideocard = videocard.value;
        variables.userRam = ram_company.value;
        variables.userRam_2 = ram_size.value;
        variables.userCabinet = cabinet.value;
        variables.userMoniter = moniter.value;
        variables.userharddisktype = harddisk_type.value;
        variables.userNumberofpcs = numberofpcs.value;        
        
        // Send the data to PHP now
        varLoader.load(varSend);


    }
}

and this the php srcipt (email.php) :

<?php
$senderName   = $_POST['userName'];
$senderEmail     = $_POST['userEmail'];
$senderPhone     = $_POST['userphone'];
$senderProcessor   = $_POST['userProcessor'];
$senderHardDisk     = $_POST['userHarddisk'];
$senderQuantity = $_POST['userNumberofpcs'];
$senderProcessor_2   = $_POST['userProcessortype'];
$senderVideocard  = $_POST['userVideocard'];
$senderRam  = $_POST['userRam'];
$senderRam_2    = $_POST['userRam_2'];
$senderHarddisk_2 = $_POST['userHarddisktype'];
$senderCabinet   = $_POST['userCabinet'];
$senderMoniter    = $_POST['userMoniter'];


// Strip slashes on the Local typed-in variables for security and run any php based error check here
$senderName   = stripslashes($senderName);
$senderEmail     = stripslashes($senderEmail);
$senderPhone   = stripslashes($senderPhone); 


$to = "pm.compsols@gmail.com";             
$from = "$senderEmail";
$subject = "New Pc Order";
// Modify the Body of the message however you like
$message = "Results from the form:


Name: $senderName 
Email: $senderEmail
Phone: $senderPhone
Processor: $senderProcessor
Hard Disk: $senderHardDisk
Quanitity: $senderQuantity
Processor_2: $senderProcessor_2
Video Card: $senderVideocard
Hard Disk Type = $senderHarddisk_2
RAM: $senderRam
RAM Size: $senderRam_2
Moniter: $senderMoniter
Cabinet: $senderCabinet 


$senderMessage";
// Build $headers Variable
$headers = "From: $from
";
$headers .= "Content-type: text
"; 
$to = "$to";
    // Send the email
    mail($to, $subject, $message, $headers);
    
    $my_msg = "Thanks $senderName, all data has been sent.";
    print "return_msg=$my_msg"; 
// Exit script    
exit();
?>

Thx In Advanvance:bucktooth: