Значение null не может быть сериализовано на самом верхнем уровне, так как тип корня IXmlSerializable "<var>Type Name</var>" с IsAny=true должен записать все свое содержание, включая корневой элемент. Проверьте правильность реализации IXmlSerializable.

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A null value cannot be serialized at the top level for IXmlSerializable root type '<var>Type Name</var>' since its IsAny setting is 'true'. This type must write all its contents including the root element. Verify that the IXmlSerializable implementation is correct.

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