Package or namespace load failed


I have updated my version of R (3.6.1) on Mac OS X El capitan 10.11.4
Since this, there are a lot of packages that I cannot use anymore.
For instance e1071 (cf attached picture)
I always get the same error message for a lot of other packages.
I don't really know what to do.
I have tried to uninstall R and reinstall it but it stays the same.

The path of least resistance, sorry to say, is to upgrade to Catalina, install XCode from the App Store and its CLI with

xcode-select -p

install R directly from the CRAN binary (not with brew or Anaconda). This is what I have on my own laptop, and I have had minimal problems all around.

Also after a major R version upgrade you have to update your packages with

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