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I'm also currently running an older version of Rstudio (Version 1.1.463) as my mac is running El Capitan (not enough memory to update). When trying to install and run 'tidymodels' I receive: 

Error: package or namespace load failed for ‘tidymodels’ in loadNamespace(j <- i[[1L]], c(lib.loc, .libPaths()), versionCheck = vI[[j]]): there is no package called ‘rstanarm’

I have then attempted to install 'rstanarm' and receive:

Package which is only available in source form, and may need compilation of
  C/C++/Fortran: ‘rstanarm’
Do you want to attempt to install these from sources? (Yes/no/cancel)

Following any of these options is unsuccessful. Is it possible to use 'tidymodels' given my situation?

Olli
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  • Welcome to SO. Can you please provide more details? How are you installing this the `rstanarm` package exactly. What error do you get when you type `Yes`? – DJJ Mar 27 '20 at 10:41
  • Thank you DJJ. I am simply trying: ``` install.packages("rstanarm") ``` When I type `Yes', I receive (after a while): ``` Error in loadNamespace(j <- i[[1L]], c(lib.loc, .libPaths()), versionCheck = vI[[j]]) : there is no package called ‘nloptr’ Calls: ... loadNamespace -> withRestarts -> withOneRestart -> doWithOneRestart Execution halted ERROR: lazy loading failed for package ‘rstanarm’ * removing ‘/Library/Frameworks/R.framework/Versions/3.6/Resources/library/rstanarm’ Warning in install.packages : installation of package ‘rstanarm’ had non-zero exit status – Olli Mar 27 '20 at 11:08
  • Ok then you need to install `nloptr` package. Have a look [here](https://cran.r-project.org/web/packages/rstanarm/index.html) to see which package is required and which package `rstanarm` import. You need to install Rcpp as well I suppose – DJJ Mar 27 '20 at 11:23
  • That has done the trick. Thank you! – Olli Mar 27 '20 at 16:54

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