function remove_playlist($playlistid)
 {
     $userid = $this->session->userdata('userid');
     $result = array("error" => FALSE);
     if (!$userid) {
         $result["error"] = "User must be logged in to access her playlist.";
     } else {
         try {
             if (!Playlist::removePlaylist($playlistid, $userid)) {
                 $result["error"] = TRUE;
             }
         } catch (Exception $e) {
             $result["error"] = $e->getMessage();
         }
     }
     echo json_encode($result);
 }