Fatal error: Uncaught Error: Class "OC\Lock\AbstractLockingProvider" not found in /users/ms-it/www/oc/lib/private/Lock/MemcacheLockingProvider.php:29 Stack trace: #0 {main} thrown in /users/ms-it/www/oc/lib/private/Lock/MemcacheLockingProvider.php on line 29