public function getAllUserRoles()
 {
     $url = $this->getUrl() . UserRoles::$ALL_USER_ROLE_LINK;
     $request = $this->setHeadersGet($url, $this->_oauthToken);
     $result = $this->doGet($request);
     if (array_key_exists('errors', $result)) {
         $errors_tmp = new Errors();
         foreach ($result as $errorData) {
             $errors_tmp = Errors::fromArray($errorData);
         }
         $errors[] = $errors_tmp;
         return $errors;
     } else {
         return UserRoles::fromArray($result);
     }
 }