Fatal error: Uncaught Error: Class 'Illuminate\Database\Eloquent\Relations\Relation' not found in /home/edmedu/www/hana-edu.co.kr/sf4l/vendor/laravel/framework/src/Illuminate/Database/Eloquent/Relations/BelongsTo.php:12 Stack trace: #0 {main} thrown in /home/edmedu/www/hana-edu.co.kr/sf4l/vendor/laravel/framework/src/Illuminate/Database/Eloquent/Relations/BelongsTo.php on line 12