My packages have mysteriously disappeared from my pane in Rstudio. When I restart Rstudio, there comes an error message saying "Error listing Packages" and "R code execution error". I addition, the console gives me another error saying: "Error in readRDS(pfile): cannot read workspace version 3 written by R 3.6.0; need R 3.5.0 or newer"
When I try to install a package (through the install-button) I get the same error message in the console.
Rstudio is inside a protected server on my computer and I have no internet connection, which is why I am downloading each package outside this computer and thereby uploading to this protected server. This has always worked in the past, but the last few days, it hasn´t.
All my earlier packages are still available to me, but I need a new one to be able to write to excel-files.
Do you have any idea how I can fix this?