Fatal error: Uncaught Error: Class "League\Fractal\Serializer\SerializerAbstract" not found in /srv/disk3/2724534/www/redgraveresearch.com/concrete/vendor/league/fractal/src/Serializer/ArraySerializer.php:18 Stack trace: #0 {main} thrown in /srv/disk3/2724534/www/redgraveresearch.com/concrete/vendor/league/fractal/src/Serializer/ArraySerializer.php on line 18