( ! ) Fatal error: Class 'Symfony\Component\Serializer\Normalizer\AbstractNormalizer' not found in /var/www/clients/client0/web4/web/vendor/symfony/serializer/Normalizer/AbstractObjectNormalizer.php on line 29
Call Stack
#	Time	Memory	Function	Location
1	0.0000	361584	{main}( )	.../AbstractObjectNormalizer.php:0