Fatal error: Class 'Illuminate\Database\Eloquent\Relations\Relation' not found in /var/www/html/dev/spa/vendor/laravel/framework/src/Illuminate/Database/Eloquent/Relations/BelongsTo.php on line 8

Call Stack:
    0.0007     260696   1. {main}() /var/www/html/dev/spa/vendor/laravel/framework/src/Illuminate/Database/Eloquent/Relations/BelongsTo.php:0