Fatal error: Uncaught exception 'JMS\Serializer\Exception\RuntimeException' with message 'Could not create cache directory "/var/www/app/cache/prod/jms_serializer".' in /var/www/vendor/jms/serializer-bundle/JMS/SerializerBundle/DependencyInjection/JMSSerializerExtension.php:70 Stack trace: #0 /var/www/vendor/symfony/symfony/src/Symfony/Component/HttpKernel/DependencyInjection/ConfigurableExtension.php(35): JMS\SerializerBundle\DependencyInjection\JMSSerializerExtension->loadInternal(Array, Object(Symfony\Component\DependencyInjection\ContainerBuilder)) #1 /var/www/vendor/symfony/symfony/src/Symfony/Component/DependencyInjection/Compiler/MergeExtensionConfigurationPass.php(50): Symfony\Component\HttpKernel\DependencyInjection\ConfigurableExtension->load(Array, Object(Symfony\Component\DependencyInjection\ContainerBuilder)) #2 /var/www/vendor/symfony/symfony/src/Symfony/Component/HttpKernel/DependencyInjection/MergeExtensionConfigurationPass.php(39): Symfony\Component\DependencyInjection\Compiler\MergeExtensionConfiguration in /var/www/vendor/jms/serializer-bundle/JMS/SerializerBundle/DependencyInjection/JMSSerializerExtension.php on line 70