[Symfony\Component\Config\Definition\Exception\InvalidConfigurationException] The child node "db_driver" at path "fos_user" must be configured.

$ php bin/console server:run


  [Symfony\Component\Config\Definition\Exception\InvalidConfigurationException]
  The child node "db_driver" at path "fos_user" must be configured.

必须新建一个USer类

[Symfony\Component\Config\Definition\Exception\InvalidConfigurationException] The child node "db_driver" at path "fos_user" must be configured.

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