On my Site https://www.studio-manager.eu running PHP 7.2 and i cannot edit page because i get the error
Warning: array_reduce() expects parameter 2 to be a valid callback, function 'rest_preload_api_request' not found or invalid function name in /homepages/34/d529549786/htdocs/clickandbuilds/StudioManager/StudioManager/wp-admin/edit-form-blocks.php on line 75
i dont know why, please help