Fatal error: Uncaught Error: Call to undefined function dataset() in /data/htmlwww/laravel-system/vendor/laravel/serializable-closure/tests/Datasets/Serializers.php:6 Stack trace: #0 {main} thrown in /data/htmlwww/laravel-system/vendor/laravel/serializable-closure/tests/Datasets/Serializers.php on line 6