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Duplicate  delete category exception

#1
Server Error

Undefined variable: updateNestedSetInfo
  1. XenForo_Application::handlePhpError() in C:\wamp\www\library\XenForo\Model\Node.php at line 1126
  2. XenForo_Model_Node->deleteChildNodes() in C:\wamp\www\library\XenForo\DataWriter\Node.php at line 238
  3. XenForo_DataWriter_Node->_postDelete() in C:\wamp\www\library\XenForo\DataWriter.php at line 1645
  4. XenForo_DataWriter->delete() in C:\wamp\www\library\XenForo\ControllerAdmin\NodeAbstract.php at line 65
  5. XenForo_ControllerAdmin_NodeAbstract->actionDelete() in C:\wamp\www\library\XenForo\FrontController.php at line 310
  6. XenForo_FrontController->dispatch() in C:\wamp\www\library\XenForo\FrontController.php at line 132
  7. XenForo_FrontController->run() in C:\wamp\www\admin.php at line 13