Fatal error: Cannot redeclare class KalturaAdminUser

Hi Experts,

I wanted to add the KWC to my Wordpress page but unfortunately I am stuck at this error:

Fatal error: Cannot redeclare class KalturaAdminUser in D:\xampp\htdocs\example\kalturaClass.php on line 858

I have installed the KalturaClient.php and below are my code. Please help!:

<?php require_once("kalturaclient.php"); ?>
<?php require_once("kalturaClass.php"); ?>

<?php
//define constants
define("KALTURA_PARTNER_ID", xxxx);
define("KALTURA_PARTNER_SERVICE_SECRET", "xxxxxxxxx");

//define session variables
$partnerUserID = 'ANONYMOUS';

//construct Kaltura objects for session initiation
$config = new KalturaConfiguration(KALTURA_PARTNER_ID);
$client = new KalturaClient($config);
$ks = $client->session->start(KALTURA_PARTNER_SERVICE_SECRET, $partnerUserID, KalturaSessionType::USER);

//Prepare variables to be passed to embedded flash object.
$flashVars = array();
$flashVars["uid"] = $partnerUserID;
$flashVars["partnerId"] = KALTURA_PARTNER_ID;
$flashVars["ks"] = $ks;
$flashVars["afterAddEntry"] = "onContributionWizardAfterAddEntry";
$flashVars["close"] = "onContributionWizardClose";
$flashVars["showCloseButton"] = false;
$flashVars["Permissions"] = 1;

?>

var params = {
allowScriptAccess: "always",
allowNetworking: "all",
wmode: "opaque"
};
// php to js
var flashVars = <?php echo json_encode($flashVars); ?>;

swfobject.embedSWF("http://www.kaltura.com/kcw/ui_conf_id/1000741 ", "kcw", "680", "360", "9.0.0", "expressInstall.swf", flashVars, params);

function onContributionWizardAfterAddEntry(entries) {
alert(entries.length + " media file/s was/were succsesfully uploaded");
for(var i = 0; i < entries.length; i++) {
alert("entries["+i+"]:EntryID = " + entries[i].entryId);
}
}

function onContributionWizardClose() {
alert("Thank you for using Kaltura ontribution Wizard");
}