问云点播的删除 执行报4500错误，怎么解决？

	url : "https://vod.api.qcloud.com/v2/index.php?Action=DeleteVodFile&fileId="+fieldids[i]+
									"&priority=0&Signature="+sign+"&SecretId="+selectedId+"&Region='gz'&Timestamp="+
									new Date().getTime()+"&Nonce="+Math.ceil(Math.random()*10000)