Error in contrib.url

Hi All: I use Ubuntu 16.04 and took the setting of the repository out of my so that it doesn't interfere with Rstudio settings. I also set the repository in Tools <- Global Options <- Packages to ""

But I'm following a tutorial step by step and, in one step, it asks me to click on Install and Restart. When I do that, I get

Error in contrib.url(repos, type )
trying to use CRAN without setting a mirror

But when I check the setting of my repository it is set to "". So,
somehow the environment where "Install and Restart" is done, does not know about the value of the repository. I looked around on the internet and I do see the same error message but the fix is not clear to me. Thanks for help from anyone.

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