入力内容にデータメンバー '<var>Member</var>' が 2 回以上見つかったため、データコントラクト型 '<var>Type Name</var>' は逆シリアル化できません。

Message in Japanese (日本語)

Unlocalized message

The data contract type '<var>Type Name</var>' cannot be deserialized because the data member '<var>Member</var>' was found more than once in the input.

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