根据 https://tweetinvi.codeplex.com/documentation

请确认您的机器时间设置正确(两者均时间和区域).时间不正确可能会导致收到 401 异常.

Please verify that the time of your machine is correctly setup (both the time and the region). Having an incorrect Time can result in receiving the 401 exception.

如果不是这种情况，请点击以下链接可能会有所帮助:

If this is not the case then following links which might be helpful:

为什么

401错误流API

Twitter API集成-远程服务器返回错误:(401)未经授权