Element '{2}:{3}' contains data of the '{0}:{1}' data contract. The deserializer has no knowledge of any type that maps to ...

Element '{2}:{3}' contains data of the '{0}:{1}' data contract. The deserializer has no knowledge of any type that maps to this contract. Add the type corresponding to '{1}' to the list of known types - for example, by using the KnownTypeAttribute attribute or by adding it to the list of known types passed to DataContractSerializer.
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