ERROR - Failed to create request token: timestamp_refused ERROR - Failed to create request token

<?
/* #############################################################################

			yahoo app platform  / wrapper / context / api 
			by: Paul Lefebvre

	 ############################################################################# */
	 
							$ip=$_SERVER['REMOTE_ADDR']; 
							/* if ($ip != "209.183.9.159") { ?> id - is temporarily down for site maintenance. <meta http-equiv="refresh" content="20;url=http://www.shopnorthern.com"> <? die;} */
							
							if (isset($_GET["flashsignrequest"]) && $_GET["flashsignrequest"] == "on") {
									//		if (isset($_SESSION["signedin"]) && $_SESSION["signedin"] == "Yes") {
											$returnVars = array();
											$returnVars['signed'] = "1";
											$returnVars['screen'] = "3";
											$returnString = http_build_query($returnVars);
											echo $returnString;
											die;
										}
											   
							// standard xss protection - initial
							foreach ($HTTP_GET_VARS as $secvalue) {
							    if ((eregi("<[^>]*script*\"?[^>]*>", $secvalue)) ||
							        (eregi("<[^>]*iframe*\"?[^>]*>", $secvalue)) ||
							        (eregi("<[^>]*object*\"?[^>]*>", $secvalue)) ||
							        (eregi("<[^>]*applet*\"?[^>]*>", $secvalue)) ||
							        (eregi("<[^>]*meta*\"?[^>]*>", $secvalue)) ||
							        (eregi("<[^>]*style*\"?[^>]*>", $secvalue)) ||
							        (eregi("<[^>]*form*\"?[^>]*>", $secvalue)) ||
							        (eregi("<[^>]*img*\"?[^>]*>", $secvalue)) ||
							        (eregi("\"", $secvalue)) ||
							        (eregi("'", $secvalue)) ||
							        (eregi("<[^>]*cookie*\"?[^>]*>", $secvalue))) {
							       die ("The server has terminated your scripting request");
							    }
							} //end standard xss protection
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

							
	//define file structure - locations
	define('ROOT',$_SERVER['DOCUMENT_ROOT'] . '/'); //document root folder
	define('MEMBERS',ROOT.'members/'); //members logged in
	define('SOURCE',ROOT.'canvas/'); //canvas (this) folder
	define('INC',ROOT .'php_inc/'); //php secure includes - must be private at launch

		require_once(INC.'errors.php'); //error reporting, etc
		require_once(INC.'Yahoo.inc'); //yahoo api, etc

    define('OAUTH_CONSUMER_KEY', 'dj0yJmk9eUxoY1dvbEFSTkdvJmQ9WVdrOU5Vc3lUVEE1TkdzbWNHbzlPRFk1TVRjM09UQTImcz1j
b25zdW1lcnNlY3JldCZ4PWU2');
    define('OAUTH_CONSUMER_SECRET', '602819be951f0299d26293a551c82b0dd7f2bbd0');
    define('OAUTH_DOMAIN', 'http://yahoo.kornerstoneintldev.garohosting.com/canvas');
    define('OAUTH_APP_ID', '5K2M094k');
	 	
		 	YahooLogger::setDebug(true);
			YahooLogger::setDebugDestination('CONSOLE');
    
    session_start();
    
    	echo $_SERVER["HTTP_HOST"];
    	
	if(array_key_exists("logout", $_GET)) {
  // if a session exists and the logout flag is detected
  // clear the session tokens and reload the page.
  YahooSession::clearSession();
  header("Location: sampleapp.php");
}

// check for the existance of a session.
// this will determine if we need to show a pop-up and fetch the auth url,
// or fetch the user's social data.
$hasSession = YahooSession::hasSession(OAUTH_CONSUMER_KEY, OAUTH_CONSUMER_SECRET, OAUTH_APP_ID);

if($hasSession == FALSE) {
  // create the callback url,
  $callback = YahooUtil::current_url()."?in_popup";

  // pass the credentials to get an auth url.
  // this URL will be used for the pop-up.
  $auth_url = YahooSession::createAuthorizationUrl(OAUTH_CONSUMER_KEY, OAUTH_CONSUMER_SECRET, $callback);
}
else {
  // pass the credentials to initiate a session
  $session = YahooSession::requireSession(OAUTH_CONSUMER_KEY, OAUTH_CONSUMER_SECRET, OAUTH_APP_ID);

  // if the in_popup flag is detected,
  // the pop-up has loaded the callback_url and we can close this window.
  if(array_key_exists("in_popup", $_GET)) {
    close_popup();
    exit;
  }

  // if a session is initialized, fetch the user's profile information
  if($session) {
    // Get the currently sessioned user.
    $user = $session->getSessionedUser();

    // Load the profile for the current user.
    $profile = $user->getProfile();
  }
}

echo "testing";

?>

ERROR - Signature from YAP failed. DEBUG - HTTP request details DEBUG OBJECT - Array ( [method] => POST [url] => https://api.login.yahoo.com/oauth/v2/get_request_token [code] => 401 [requestHeaders] => Array ( [0] => Accept: application/json [1] => Content-Type: application/x-www-form-urlencoded ) [requestBody] => oauth_callback=http%3A%2F%2Fyahoo.kornerstoneintldev.garohosting.com%2Fcanvas%2F%3Fin_popup&oauth_consumer_key=dj0yJmk9eUxoY1dvbEFSTkdvJmQ9WVdrOU5Vc3lUVEE1TkdzbWNHbzlPR
Fk1TVRjM09UQTImcz1jb25zdW1lcnNlY3JldCZ4PWU2&oauth_nonce=401113646931af05646fe763c6996b3c&oauth_signature=jRfkDgJcEuJoOmSYjht4K0k0DrI%3D&oauth_signature_method=HMAC-SHA1&oauth_timestamp=1257508215&oauth_version=1.0 [responseHeaders] => Array ( [Date] => Fri, 06 Nov 2009 17:28:33 GMT [P3P] => policyref="http://info.yahoo.com/w3c/p3p.xml", CP="CAO DSP COR CUR ADM DEV TAI PSA PSD IVAi IVDi CONi TELo OTPi OUR DELi SAMi OTRi UNRi PUBi IND PHY ONL UNI PUR FIN COM NAV INT DEM CNT STA POL HEA PRE LOC GOV" [WWW-Authenticate] => OAuth oauth_problem=timestamp_refused&oauth_acceptable_timestamps=1257527913-1257529113 [Connection] => close [Transfer-Encoding] => chunked [Content-Type] => application/x-www-form-urlencoded ) [responseBody] => oauth_problem=timestamp_refused&oauth_acceptable_timestamps=1257527913-1257529113 ) ERROR - Failed to create request token: timestamp_refused ERROR - Failed to create request token testing