framework:
    validation:
        cache: validator.mapping.cache.doctrine.apc
    serializer:
        cache: serializer.mapping.cache.apc

doctrine:
    orm:
        Metadata_cache_driver: apcu
        result_cache_driver: apcu
        query_cache_driver: apcu

网站工作正常,但是当我发送表单时,我总是收到此错误：

这是我的作曲家：

"require": {
    "PHP": ">=5.5.9","symfony/symfony": "3.0.*","doctrine/orm": "^2.5","doctrine/doctrine-bundle": "^1.6","doctrine/doctrine-cache-bundle": "^1.2","symfony/swiftmailer-bundle": "^2.3","symfony/monoLOG-bundle": "^2.8","sensio/distribution-bundle": "^5.0","sensio/framework-extra-bundle": "^3.0.2","incenteev/composer-parameter-handler": "^2.0","knplabs/knp-paginator-bundle": "^2.5","liip/imagine-bundle": "^1.5","jms/serializer-bundle": "^1.1","symfony/assetic-bundle": "^2.8","gopay/payments-sdk-PHP": "^1.1","knplabs/knp-snappy-bundle": "~1.4","friendsofsymfony/user-bundle": "~2.0@dev"

为什么Symfony调用apc_fetch而不是apcu_fatch？