使用官方提供的AndroidSDK Demo, 上传图片失败

Question

下载了官方提供的Android SDK Demo, 运行工程下载到手机后发现总是上传图片失败，错误信息如下，请看看什么问题：
UpYunException [code=403, message=Not accept, Signature error, url=/test/1401419481820.jpg, time=1401333022, signString=51cccf12fe15a51436361ce34c380629, isSigned=true]

伊谢尔伦 · Answer

Error message: Signature error. Please refer to the SDK documentation for details. Also note that there is this file under the url

阿神 · Answer

Demo? Where is it?