I can't knit any Rmd files (which were knitting just fine yesterday).
Whenever I knit, I was prompted that "Rendering R Markdown documents requires an updated version of the markdown package."
I have updated the markdown packages over and over, with different options provided online, such as switching to different CRAN mirror, install.packages("markdown", repos = "https://cran.revolutionanalytics.com")
or using devtools::install_github("rstudio/markdown")
Nothing works. Suggestions?