Namespace

Symfony\Component\Config\Definition\Exception

DuplicateKeyException This exception is thrown whenever the key of an array is not unique.
Exception Base exception for all configuration exceptions
ForbiddenOverwriteException This exception is thrown when a configuration path is overwritten from a subsequent configuration file, but the entry node specifically forbids this.
InvalidConfigurationException A very general exception which can be thrown whenever non of the more specific exceptions is suitable.
InvalidTypeException This exception is thrown if an invalid type is encountered.
UnsetKeyException This exception is usually not encountered by the end-user, but only used internally to signal the parent scope to unset a key.