Error: Error #2101: The String passed to URLVariables.decode() must be a URL-encoded query string containing name/value pairs.

i get Error: Error #2101: The String passed to URLVariables.decode() must be a URL-encoded query string containing name/value pairs.

can anyone help me please

this my as3 flash code

package communication2 {

    import flash.display.MovieClip;

    import flash.display.Sprite;

    import flash.events.*;

    import flash.text.TextField;

    import flash.net.navigateToURL;

    import fl.data.DataProvider;

    import flash.net.URLVariables;

    import flash.net.URLRequest;

    import flash.net.URLRequestMethod;

    import flash.net.URLLoader;

    import flash.net.URLLoaderDataFormat;

    import flash.events.IOErrorEvent;

    public class Communication2 extends MovieClip {

private var myRequest:URLRequest;

private var myVars:URLVariables;

private var myLoader:URLLoader;

        public function Communication2() {

myVars = new URLVariables();

myRequest = new URLRequest();

myRequest.url="http://localhost/login/communication2.php";

myRequest.method=URLRequestMethod.POST;

myRequest.data=myVars;

myLoader = new URLLoader();

myLoader.dataFormat = URLLoaderDataFormat.VARIABLES;

myLoader.addEventListener(Event.COMPLETE, showGrid);

myLoader.addEventListener(IOErrorEvent.IO_ERROR, showError);

getData();

mySubmit.addEventListener(MouseEvent.CLICK, submitData);

}

function submitData(e:MouseEvent) {

if (firstName.text == "" || lastName.text == "" || fear.text == "") {

navigateToURL(new URLRequest("javascript:alert('Please enter all fields');"), "_self");

} else {

getData(firstName.text, lastName.text, fear.text);

firstName.text = lastName.text = fear.text = "";

}

}

function getData(myFirstName:String="", myLastName:String="", myFear:String="") {

myVars.firstName = myFirstName;

myVars.lastName = myLastName;

myVars.fear = myFear;

myLoader.load(myRequest);

}

private function showGrid(e:Event) {

var newVars:URLVariables = new URLVariables(e.target.data);

trace (newVars.simpleVariable);

if (newVars.error == 0) {

var myDataProvider:Array = [];

for (var i:uint=1; i<=newVars.total; i++) {

myDataProvider.push({firstName:newVars["firstName"+i], lastName:newVars["lastName"+i], fear:newVars["fear"+i]});

}

myGrid.columns = ["firstName", "lastName", "fear"];

myGrid.dataProvider = new DataProvider(myDataProvider);

myGrid.getColumnAt(0).headerText = "First Name";

myGrid.getColumnAt(0).width = 100;

myGrid.getColumnAt(1).headerText = "Last Name";

myGrid.getColumnAt(1).width = 100;

myGrid.getColumnAt(2).headerText = "Greatest Fear";

} else {

trace("There was an error in PHP");

}

}

        private function showError(e:IOErrorEvent) {

            trace("There was an error!");

        }

    }

}

and the php code

<?php

$firstName = isset($_POST['firstName']) ? $_POST['firstName'] : "";

$lastName = isset($_POST['lastName']) ? $_POST['lastName'] : "";

$fear = isset($_POST['fear']) ? $_POST['fear'] : "";

$date = date("Y-m-d");

$error = 0;

$db = mysql_connect("localhost", "username", "password");

mysql_select_db("database",$db);

if ($firstName != "") {

$query = "INSERT INTO fears (id, firstName, lastName, fear, date) VALUES ('', '$firstName', '$lastName', '$fear', '$date')";

$result = mysql_query($query,$db);

if (!$result) {

$error = "Sorry could not record fear";

}

}

echo "simpleVariable=simple value";

$query = "SELECT * FROM fears";

$result = mysql_query($query,$db);

$total = mysql_num_rows($result);

$output = "";

if ($result) {

$i=0;

while ($myrow = mysql_fetch_array($result)) {

$i++;

$output .= "&firstName".$i."=".urlencode($myrow['firstName']).

   "&lastName".$i."=".urlencode($myrow['lastName']).

   "&fear".$i."=".urlencode($myrow['fear']);

}

} else {

$error = "Sorry could not access fears";

}

echo "&total=".urlencode($total)."&error=".urlencode($error).$output;

?>