In XF 1.5 RC2 i cannot update to SC 2.5

Is this correct?

Code:

ErrorException: Undefined index: tags - library/NFLJ/Showcase/Model/Item.php:751
Generiert durch: BT012SS, Vor 11 Minuten
Stapelverfolgung

#0 /home/forum/library/NFLJ/Showcase/Model/Item.php(751): XenForo_Application::handlePhpError(8, 'Undefined index...', '/home/www/doc/2...', 751, Array)
#1 /home/www/forum/library/NFLJ/Showcase/Model/Item.php(1088): NFLJ_Showcase_Model_Item->prepareItem(Array, Array, Array, false, false)
#2 /home/forum/library/NFLJ/Showcase/XenForo/ControllerPublic/Forum.php(144): NFLJ_Showcase_Model_Item->prepareItems(Array, true)
#3 /home/forum/library/AttachStats/ControllerPublic/Forum.php(7): NFLJ_Showcase_XenForo_ControllerPublic_Forum->actionIndex()
#4 /home/forum/library/DailyStats/ControllerPublic/Forum.php(7): AttachStats_ControllerPublic_Forum->actionIndex()
#5 /home/forum/library/XenForo/FrontController.php(347): DailyStats_ControllerPublic_Forum->actionIndex()
#6 /home/forum/library/XenForo/FrontController.php(134): XenForo_FrontController->dispatch(Object(XenForo_RouteMatch))
#7 /home/forum/index.php(13): XenForo_FrontController->run()
#8 {main}

Benötigter Status

array(3) {
  ["url"] => string(24) "http://www.gsx-r1000.de/"
  ["_GET"] => array(0) {
  }
  ["_POST"] => array(0) {
  }
}

 

Thanks