Error loading tidyverse and other packages on my Mac

Hi, and welcome!

For future reference, please see the FAQ: What's a reproducible example (`reprex`) and how do I do one? Using a reprex, complete with representative data will attract quicker and more answers.

Do you see the following from a terminal window:

 $ 529:  ls -l  /Library/Frameworks/R.framework/Versions/3.6/Resources/lib/ | grep libc.*
-rwxrwxr-x  1 root  admin   825K Dec 12 10:55 libc++.1.dylib*
-rwxrwxr-x  1 root  admin   212K Dec 12 10:55 libc++abi.1.dylib*