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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.
InvalidDefinitionException	Thrown when an error is detected in a node Definition.
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.