A database error has occurred. Did you forget to run maintenance/update.php after upgrading? See: https://www.mediawiki.org/wiki/Manual:Upgrading#Run_the_update_script
Query: REPLACE INTO `de_objectcache` (keyname,value,exptime) VALUES ('usr_web642_1-de_:messages:de:lock','˴2\0','20140725181551')
Function: SqlBagOStuff::set
Error: 1142 INSERT command denied to user 'web642'@'localhost' for table 'de_objectcache' (localhost)