A popup with the following error: "Class 'Mavitm\Estate\Controllers\Flash' not found" on line 58 of /........./plugins/mavitm/estate/controllers/Realties.php Help me please.

And here, too, an error when adding a topic: file_put_contents(/var/www/html/storage/framework/cache/96/1c/961c2864a15335dc579d6502ae5c5f79c81c3188): failed to open stream: Permission denied