Within the last 24 hours (but not before) I also received errors relating to readr , for me it was crashing deployment of my Shiny app. Specifically it was at this step
building: Building package: readr
which did not occur before. I uninstall/re-installed it but no luck. The only success I had was to uninstall the version of R I was using, delete the old readr library (and I also removed several others) - then upgraded to R 4.1.2 and do a fresh install.packages("readr")