Один из известных типов, предоставленных в аргументе "<var>X</var>", недопустим, так как имеет значение null. Все указываемые известные типы должны иметь значения, отличные от null.

Message in Russian (Русский)

Unlocalized message

One of the known types provided to the serializer via '<var>X</var>' argument was invalid because it was null. All known types specified must be non-null values.

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