Zend framework 未捕获异常“Zend_Gdata_App_AuthException”，消息为“与谷歌的身份验证失败”。原因：不良身份验证'

这是我运行的脚本，这是工作本地机器不在线，请给我任何建议

private function login($user,$pass)
{               
    require_once 'Zend/Loader.php';
    Zend_Loader::loadClass('Zend_Http_Client');
    Zend_Loader::loadClass('Zend_Gdata');
    Zend_Loader::loadClass('Zend_Gdata_ClientLogin');
    Zend_Loader::loadClass('Zend_Gdata_Spreadsheets');

    $service = Zend_Gdata_Spreadsheets::AUTH_SERVICE_NAME;
    $http = Zend_Gdata_ClientLogin::getHttpClient($user,$pass,$service);
    $this->client = new Zend_Gdata_Spreadsheets($http);

    if ($this->client instanceof Zend_Gdata_Spreadsheets) return TRUE;

    return FALSE;
}`