Fatal error: Uncaught Error: Class 'Symfony\Component\Serializer\Encoder\SerializerAwareEncoder' not found in /home/optinadmin/rfl.optin.co.nz/concrete/vendor/symfony/serializer/Symfony/Component/Serializer/Encoder/XmlEncoder.php:23 Stack trace: #0 {main} thrown in /home/optinadmin/rfl.optin.co.nz/concrete/vendor/symfony/serializer/Symfony/Component/Serializer/Encoder/XmlEncoder.php on line 23