Many packages don't work under R version 4.0.2 although they worked fine in previous versions.

[murgeta]

I am using RStudio. I updated my R version from 3.6.1 to 4.0.2 and since then many packages won't work. I am getting the following messages. What can I do to fix this?

> library(EEM)
Error: package or namespace load failed for ‘EEM’ in loadNamespace(j <- i[[1L]], c(lib.loc, .libPaths()), versionCheck = vI[[j]]):
 there is no package called ‘vctrs’
> data2 <- readEEM(getwd()) 
Error in readEEM(getwd()) : could not find function "readEEM"

> library(readxl)
Error: package or namespace load failed for ‘readxl’ in namespaceExport(ns, exports):
 undefined exports: excel_format, excel_sheets, format_from_ext, format_from_signature, read_excel, read_xls, read_xlsx, readxl_example, readxl_progress

[elmstedt]

Each version of R you have installed maintains it's open library of packages. When you install a new version of R you must re-install any packages you intend on using.

[andresrcs]

If you are going to keep your old library or copy your packages to the new location you have to update your packages with checkBuilt = TRUE

update.packages(checkBuilt=TRUE)