尝试发布一个R笔记本，并不断得到相同的错误(在设计中出错)。url(repos，“源”)试图在不设置镜像的情况下使用CRAN。

I use OSX Yosemite with XQuartz as was suggested in other questions, and I've been attempting to publish a notebook but get the same error every time. This is what the .R file looks like:I use OSX Yosemite with XQuartz as was suggeste