rmarkdown not working due to pandoc

Question

Hi I just updated my version of RStudio and now I cannot create markdown files. I upgraded RStudio to verion: 1.0.136

My version of R is 3.2.5. 

Version of these packages:
knitr: 1.15.1
rmarkdown: 1.4

Note I already installed MikTEX and it was working just fine. I was craeted markdown documents.

Now I Simply create a new r markdown pdf file and click knit and I get this error:

pandoc version 1.12.3 or higher is required and was not found

What do I need to do to get knit to run?

when I run

> pandoc_available(version = NULL, error = FALSE)
[1] FALSE
> 
> pandoc_version()
NULL

Answer 1

I had this issue when using a server. I was able to run .Rmd files after installing pandoc through the terminal.

sudo apt-get install pandoc

Then for html output calling the .Rmd with

R -e rmarkdown::render('/path/to/file.Rmd',output_file='/path/to/output.html')

Answer 2

If you are on a windows machine this is the simplest way install pandoc.

install.packages("installr")
library(installr) 

install.pandoc()

Answer 3

Opción cuando no se es administrador del equipo:

Paso #1 se identifica la ruta en la que R tiene mapeado Pandoc.

Sys.getenv("RSTUDIO_PANDOC") [1] "C:/Users/Cuenta_Usuario/Documents/rstudio-pandoc"

Paso #2 se verifica que exista el directorio, en caso contrario crearlo.

Paso #3 Descargar la versión más reciente de pandoc https://github.com/jgm/pandoc/releases/tag/2.7.3 en mi caso descargué pandoc-2.7.3-windows-x86_64.zip

Paso #4 descomprimir el archivo .zip en la ruta identificada en el paso #1.

con estos pasos ya me funcionó de manera satisfactoria.