Значение "<var>X</var>" не является уникальным для "Content-ID" в заданных пакетных запросах. В пакетных запросах каждый заголовок "Content-ID" должен иметь уникальное значение.

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Unlocalized message

'<var>X</var>' is not a unique 'Content-ID' in the given batch requests. In batch requests, every 'Content-ID' must be a unique value.

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