Pandoc is a program that R Studio relies on to create html files. You may be required to download (https://github.com/jgm/pandoc/releases/tag/2.4) and install (instructions here: https://pandoc.org/installing.html) the pandoc program on your computer. I would also recommend downloading and install MiKTeX (mentioned on the pandoc install page mentioned above; see here: https://miktex.org/) which will allow you to create pdf files.
Pandoc is a program that R Studio relies on to create html files. You may be required to download (https://github.com/jgm/pandoc/releases/tag/2.4) and install (instructions here: https://pandoc.org/installing.html) the pandoc program on your computer. I would also recommend downloading and install MiKTeX (mentioned on the pandoc install page mentioned above; see here: https://miktex.org/) which will allow you to create pdf files.