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Error 3021: System temporarily unavailable, please try listing again

Hi all, I am using AddItem API to put products on sandbox (US). This was no problem before. But about a week ago, it always returns error 3021: "System temporarily unavailable, please try listing again.". <Errors> <ShortMessage>System temporarily unavailable, please try listing again.</ShortMessage> <LongMessage>System temporarily unavailable, please try listing again.</LongMessage> <ErrorCode>3021</ErrorCode> <SeverityCode>Error</SeverityCode> <ErrorClassification>SystemError</ErrorClassification> </Errors> Does anyone know the cause and solution? Please help me. Thanks very much!
erroradditemerror-sandbox
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