Session Fehler?

	private function generateCaptcha() {	
		$captcha = new Zend_Captcha_Image();
	
		$captcha->setTimeout(’300)
		->setWordLen(’6′)
		->setHeight(’80′)
		->setFont(‘/path/to/your/fontFile.ttf’)
		->setImgDir(‘/path/to/your/image/captchaDirectory’);
	
		$captcha->generate();    //command to generate session + create image


		return $captcha->getId();   //returns the ID given to session & image
		}

$paths = LOCAL_PATH_ZEND;
set_include_path($paths);
require_once 'Zend/Loader.php'; 
@Zend_Loader::registerAutoload();
include_once(“Zend/Captcha/image.php”);
Zend_Session::rememberMe(604800); 
$authNamespace	= new Zend_Session_Namespace('Zend_Auth');

[B]Fatal error: Uncaught exception 'Zend_Session_Exception' with message 'Seconds must be positive.' in ...[/B]