Fatal error: Uncaught Error: Class 'Illuminate\Database\Eloquent\Relations\Relation' not found in /home/noct-c/www/tanakahashi/vendor/laravel/framework/src/Illuminate/Database/Eloquent/Relations/BelongsTo.php:10 Stack trace: #0 {main} thrown in /home/noct-c/www/tanakahashi/vendor/laravel/framework/src/Illuminate/Database/Eloquent/Relations/BelongsTo.php on line 10