when I want to display planning on V8.1.1, screen freeze, and after reconnecting, this is in log files:

2019-07-14 14:55:22.404 ** ERROR ** [V8.1.1] Error on SqlElement to get 'surbooked' for Class 'ActivityPlanningElement' : field 'surbooked' not found in Database.
2019-07-14 14:55:22.406 ** ERROR ** [V8.1.1] Error on SqlElement to get 'surbooked' for Class 'ActivityPlanningElement' : field 'surbooked' not found in Database.
2019-07-14 14:55:22.408 ** ERROR ** [V8.1.1] Error on SqlElement to get 'surbooked' for Class 'ActivityPlanningElement' : field 'surbooked' not found in Database.
2019-07-14 14:55:22.410 ** ERROR ** [V8.1.1] Error on SqlElement to get 'surbooked' for Class 'Assignment' : field 'surbooked' not found in Database.
2019-07-14 14:55:22.412 ** ERROR ** [V8.1.1] Error on SqlElement to get 'surbooked' for Class 'Assignment' : field 'surbooked' not found in Database.
2019-07-14 14:55:22.413 ** ERROR ** [V8.1.1] Error on SqlElement to get 'surbooked' for Class 'Assignment' : field 'surbooked' not found in Database.
2019-07-14 14:55:22.414 ** ERROR ** [V8.1.1] Error on SqlElement to get 'surbooked' for Class 'Assignment' : field 'surbooked' not found in Database.
2019-07-14 14:55:22.415 ** ERROR ** [V8.1.1] Error on SqlElement to get 'surbooked' for Class 'Assignment' : field 'surbooked' not found in Database.
2019-07-14 14:55:22.415 ** ERROR ** [V8.1.1] Error on SqlElement to get 'surbooked' for Class 'Assignment' : field 'surbooked' not found in Database.
2019-07-14 14:55:22.416 ** ERROR ** [V8.1.1] Error on SqlElement to get 'surbooked' for Class 'Assignment' : field 'surbooked' not found in Database.
2019-07-14 14:55:22.417 ** ERROR ** [V8.1.1] Error on SqlElement to get 'surbooked' for Class 'Assignment' : field 'surbooked' not found in Database.
2019-07-14 14:55:22.418 ** ERROR ** [V8.1.1] Error on SqlElement to get 'surbooked' for Class 'Assignment' : field 'surbooked' not found in Database.
2019-07-14 14:55:22.418 ** ERROR ** [V8.1.1] Error on SqlElement to get 'surbooked' for Class 'Assignment' : field 'surbooked' not found in Database.
2019-07-14 14:55:22.419 ** ERROR ** [V8.1.1] Error on SqlElement to get 'surbooked' for Class 'Assignment' : field 'surbooked' not found in Database.
2019-07-14 14:55:22.420 ** ERROR ** [V8.1.1] Error on SqlElement to get 'surbooked' for Class 'Assignment' : field 'surbooked' not found in Database.
2019-07-14 14:55:22.421 ** ERROR ** [V8.1.1] Error on SqlElement to get 'surbooked' for Class 'Assignment' : field 'surbooked' not found in Database.
2019-07-14 14:55:22.421 ** ERROR ** [V8.1.1] Error on SqlElement to get 'surbooked' for Class 'Assignment' : field 'surbooked' not found in Database.
2019-07-14 14:55:22.422 ** ERROR ** [V8.1.1] Error on SqlElement to get 'surbooked' for Class 'Assignment' : field 'surbooked' not found in Database.
2019-07-14 14:55:22.423 ** ERROR ** [V8.1.1] Error on SqlElement to get 'surbooked' for Class 'Assignment' : field 'surbooked' not found in Database.
2019-07-14 14:55:22.426 ** ERROR ** [V8.1.1] Error on SqlElement to get 'surbooked' for Class 'ActivityPlanningElement' : field 'surbooked' not found in Database.
2019-07-14 14:55:22.428 ** ERROR ** [V8.1.1] Error on SqlElement to get 'surbooked' for Class 'ActivityPlanningElement' : field 'surbooked' not found in Database.
2019-07-14 14:55:22.430 ** ERROR ** [V8.1.1] Error on SqlElement to get 'surbooked' for Class 'ActivityPlanningElement' : field 'surbooked' not found in Database.
2019-07-14 14:55:22.432 ** ERROR ** [V8.1.1] Error on SqlElement to get 'surbooked' for Class 'ActivityPlanningElement' : field 'surbooked' not found in Database.
2019-07-14 14:55:22.434 ** ERROR ** [V8.1.1] Error on SqlElement to get 'surbooked' for Class 'ActivityPlanningElement' : field 'surbooked' not found in Database.
2019-07-14 14:55:22.437 ** ERROR ** [V8.1.1] Error on SqlElement to get 'surbooked' for Class 'ActivityPlanningElement' : field 'surbooked' not found in Database.
2019-07-14 14:55:22.439 ** ERROR ** [V8.1.1] Error on SqlElement to get 'surbooked' for Class 'ActivityPlanningElement' : field 'surbooked' not found in Database.
2019-07-14 14:55:22.441 ** ERROR ** [V8.1.1] Error on SqlElement to get 'surbooked' for Class 'ActivityPlanningElement' : field 'surbooked' not found in Database.
2019-07-14 14:55:22.442 ** ERROR ** [V8.1.1] Error on SqlElement to get 'surbooked' for Class 'ActivityPlanningElement' : field 'surbooked' not found in Database.
2019-07-14 14:55:22.444 ** ERROR ** [V8.1.1] Error on SqlElement to get 'surbooked' for Class 'ActivityPlanningElement' : field 'surbooked' not found in Database.
2019-07-14 14:55:22.446 ** ERROR ** [V8.1.1] Error on SqlElement to get 'surbooked' for Class 'ActivityPlanningElement' : field 'surbooked' not found in Database.
2019-07-14 14:55:22.448 ** ERROR ** [V8.1.1] Error on SqlElement to get 'surbooked' for Class 'ActivityPlanningElement' : field 'surbooked' not found in Database.
2019-07-14 14:55:22.450 ** ERROR ** [V8.1.1] Error on SqlElement to get 'surbooked' for Class 'ActivityPlanningElement' : field 'surbooked' not found in Database.
2019-07-14 14:55:22.451 ** ERROR ** [V8.1.1] Error on SqlElement to get 'surbooked' for Class 'ActivityPlanningElement' : field 'surbooked' not found in Database.
2019-07-14 14:55:22.453 ** ERROR ** [V8.1.1] Error on SqlElement to get 'surbooked' for Class 'ActivityPlanningElement' : field 'surbooked' not found in Database.
2019-07-14 14:55:22.455 ** ERROR ** [V8.1.1] Error on SqlElement to get 'surbooked' for Class 'ActivityPlanningElement' : field 'surbooked' not found in Database.
2019-07-14 14:55:22.457 ** ERROR ** [V8.1.1] Error on SqlElement to get 'surbooked' for Class 'ActivityPlanningElement' : field 'surbooked' not found in Database.
2019-07-14 14:55:22.459 ** ERROR ** [V8.1.1] Error on SqlElement to get 'surbooked' for Class 'Assignment' : field 'surbooked' not found in Database.
2019-07-14 14:55:22.459 ** ERROR ** [V8.1.1] Error on SqlElement to get 'surbooked' for Class 'Assignment' : field 'surbooked' not found in Database.
2019-07-14 14:55:22.460 ** ERROR ** [V8.1.1] Error on SqlElement to get 'surbooked' for Class 'Assignment' : field 'surbooked' not found in Database.