Hi Caihua, I would not be able to determine the exact cause of the *RequestError.UNKNOWN* right now. To do so, I would require the complete SOAP request and response as it usually provides a more in depth detail as to which caused the error. Should you encounter the issue once again, you may create a new thread or reply privately to me via the *Reply privately to author* in order to avoid exposing sensitive information pertaining to your account.
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