新手，下载了.net的一个例子，报错。
从阿里云站点下载了一个包，里面包含了一个demo，运行demo的时候。提示错误
Aliyun SDK for .NET Samples!
Failed with error info: BucketAlreadyExists; Error info: The requested bucket na
me is not available. The bucket namespace is shared by all users of the system.
Please select a different name and try again..
RequestID:5A2F2E985CC26B30E8715504 HostID:demo10-oh-yeah.oss-cn-hangzhou.al
iyuncs.com
Failed with error code: CallbackFailed; Error info: Error status : -1.OSS can no
t connect to your callbackUrl, please check it..
RequestID:5A2F2E985CC26B30E8715706 HostID:demo10-oh-yeah.oss-cn-hangzhou.al
iyuncs.com
Error status : -1.OSS can not connect to your callbackUrl, please check it.
Failed with error code: CallbackFailed; Error info: Error status : -1.OSS can no
t connect to your callbackUrl, please check it..
RequestID:5A2F2EA35CC26B30E871BBF7 HostID:demo10-oh-yeah.oss-cn-hangzhou.al
iyuncs.com
Failed with error code: CallbackFailed; Error info: Error status : -1.OSS can no
t connect to your callbackUrl, please check it..
RequestID:5A2F2EA85CC26B30E871F39E HostID:demo10-oh-yeah.oss-cn-hangzhou.al
iyuncs.com
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