Fatal error: Class 'Illuminate\Database\Eloquent\Relations\Relation' not found in /var/www/html/dev/spa/vendor/laravel/framework/src/Illuminate/Database/Eloquent/Relations/BelongsToMany.php on line 9

Call Stack:
    0.0019     372872   1. {main}() /var/www/html/dev/spa/vendor/laravel/framework/src/Illuminate/Database/Eloquent/Relations/BelongsToMany.php:0