Fatal error: Uncaught Error: Class "Illuminate\Database\QueryException" not found in /home/mysaferhost/laravelproject.com/book-review/vendor/laravel/framework/src/Illuminate/Database/UniqueConstraintViolationException.php:5 Stack trace: #0 {main} thrown in /home/mysaferhost/laravelproject.com/book-review/vendor/laravel/framework/src/Illuminate/Database/UniqueConstraintViolationException.php on line 5