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XF 1.3 Server error's


Could anyone help us we keep getting server error when we try and post on the forum. We have spoken to our host and they have said its msql database that needs cleaning does anyone know how this is done?
Mysqli statement execute error : Out of range value for column 'alerts_unread' at row 1
  1. Zend_Db_Statement_Mysqli->_execute() in Zend/Db/Statement.php at line 297
  2. Zend_Db_Statement->execute() in Zend/Db/Adapter/Abstract.php at line 479
  3. Zend_Db_Adapter_Abstract->query() in XenForo/DataWriter/Alert.php at line 98
  4. XenForo_DataWriter_Alert->_postSave() in XenForo/DataWriter.php at line 1409
  5. XenForo_DataWriter->save() in XenForo/Model/Alert.php at line 452
  6. XenForo_Model_Alert->alertUser() in XenForo/Model/Alert.php at line 426
  7. XenForo_Model_Alert::alert() in XenForo/Model/ForumWatch.php at line 310
  8. XenForo_Model_ForumWatch->sendNotificationToWatchUsersOnMessage() inXenForo/DataWriter/DiscussionMessage/Post.php at line 176
  9. XenForo_DataWriter_DiscussionMessage_Post->_postSaveAfterTransaction() in XenForo/DataWriter.php at line 1423
  10. XenForo_DataWriter->save() in XenForo/DataWriter/Discussion.php at line 477
  11. XenForo_DataWriter_Discussion->_saveFirstMessageDw() in XenForo/DataWriter/Discussion.php at line 426
  12. XenForo_DataWriter_Discussion->_postSave() in XenForo/DataWriter.php at line 1409
  13. XenForo_DataWriter->save() in XenForo/ControllerPublic/Forum.php at line 679
  14. XenForo_ControllerPublic_Forum->actionAddThread() in XenForo/FrontController.php at line 347
  15. XenForo_FrontController->dispatch() in XenForo/FrontController.php at line 134
  16. XenForo_FrontController->run() in /home/content/13/11491013/html/index.php at line 13