Fatal error: Uncaught Error: Interface "Maatwebsite\Sidebar\Group" not found in /home/bookshelter/public_html/vendor/maatwebsite/laravel-sidebar/src/Domain/DefaultGroup.php:15 Stack trace: #0 {main} thrown in /home/bookshelter/public_html/vendor/maatwebsite/laravel-sidebar/src/Domain/DefaultGroup.php on line 15