问AuthFailure？

加签sign: QjzaaneS+6XPJ1FZzO/UZ9+x+v4=

请求url: https://vod.api.qcloud.com/v2/index.php?Action=DeleteVodFile&Limit=20&Nonce=58527&Offset=0&Region=ap-guangzhou&SecretId=AKIDaanWiVcHY03ihKzz4s2ozTlllPt2e7aT&Signature=QjzaaneS%2B6XPJ1FZzO%2FUZ9%2Bx%2Bv4%3D&Timestamp=1557818678&Version=Tue+May+14+15%3A24%3A38+CST+2019&fileId=5285890788976757520&isFlushCdn=1&priority=0

HttpResult [success=true, status=200, dataStr={"code":4100,"message":"\u8eab\u4efd\u8ba4\u8bc1\u5931\u8d25\uff0c\u7528\u6237\u8eab\u4efd\u9a8c\u8bc1\u5931\u8d25","codeDesc":"AuthFailure"}, dataJson={code=4100, message=身份认证失败，用户身份验证失败, codeDesc=AuthFailure}]

请问什么原因导致的？在线等，急急急！