Whenever I do library(readr) my R aborts, and the old version of readr cannot be installed

[parkjooyoung99]

Please briefly describe your problem and what output you expect. If you have a question, please don't use this form. Instead, ask on https://stackoverflow.com/ or https://community.rstudio.com/.

Please include a minimal reproducible example (AKA a reprex). If you've never heard of a reprex before, start by reading https://www.tidyverse.org/help/#reprex.

Brief description of the problem

1. whenever I load readr in R environment, my R session aborts. This keeps me from installing other packages that requires readr.
2. I tried to downgrade readr by installing old version, but it could not be installed due to the error that I could not figure out.

Since 1 issue results in session abort and reprex() met error with 2 issue, I am adding link with html file and rmd file where my errors are described. 

rmd file: https://drive.google.com/file/d/1gg7ZLPCWxLOAZ_nFg_qqm-Hs02OtGgaz/view?usp=share_link
html file: https://drive.google.com/file/d/1N7LKiXKWT02iVWAcQdO3IGptiJPyEZ7S/view?usp=share_link

[hadley]

I'd suggest:

1. Closing all open instances of R/RStudio on your computer
2. Installing the pak package install.packges("pak")
3. Using pak to install readr with pak::pak("readr")

That is more likely to reveal what the problem is.