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I have recently upgraded to the latest version of R Studio Version 1.0.153. However in the previous version the packages processmapR and DiagrammeR were getting installed easily but now the after installing and loading the package, this is the error I am getting. Please help me.

install.packages("processmapR")
library(processmapR)

Error in loadNamespace(i, c(lib.loc, .libPaths()), versionCheck = vI[[i]]) : 
there is no package called ‘DiagrammeR’
In addition: Warning message:
package ‘processmapR’ was built under R version 3.3.3 
Error: package or namespace load failed for ‘processmapR’
AK94
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    So, you need to install package **DiagrammeR**. – F. Privé Aug 24 '17 at 05:44
  • Hi Prive, Again, getting this error: Error in loadNamespace(j <- i[[1L]], c(lib.loc, .libPaths()), versionCheck = vI[[j]]) : namespace 'grDevices' 3.3.1 is already loaded, but >= 3.4.0 is required ERROR: lazy loading failed for package 'DiagrammeR' * removing 'C:/Users/ashminkaul/Documents/R/win-library/3.3/DiagrammeR' – AK94 Aug 24 '17 at 05:54
  • Restart your R session and try again. – F. Privé Aug 24 '17 at 06:01
  • Won't help Sir, tried it. please see this page, I am trying to follow it on my newer version but errors are persisting: => https://www.bupar.net/about.html – AK94 Aug 24 '17 at 06:08
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    I've installed all 6 packages without any problem. And loaded package **processmapR**. Which version of R (not RStudio) do you have (check with `sessionInfo()`)? You may need to have R 3.4.0 for some reason. – F. Privé Aug 24 '17 at 06:37
  • Yes, for whatever reason the newest version of the DiagrammeR package requires `grDevices` 3.4.0 (you can confirm at https://cran.r-project.org/web/packages/DiagrammeR/index.html, where it does indeed import `grDevices (>= 3.4.0)`, which is only provided with R 3.4.0 and above) – Kevin Ushey Aug 25 '17 at 05:48
  • Thanks a lot Kevin for your help and also to F. Prive. I downloaded the R compiler from cran version 3.4.1 and it ran perfectly. – AK94 Aug 26 '17 at 13:26

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