YAML error with Rmd when I tri to knit it

[mfrontini]

Hi everyone

i started to use Rmarkdown yesterday but I can't knit my Rmd in html. When I try to do it, I have this error

Error in yaml::yaml.load(..., eval.expr = TRUE) : 
 unused argument (eval.expr = TRUE)
Calls: <Anonymous> ... parse_yaml_front_matter -> yaml_load -> <Anonymous>

I use R version 3.3.2 (2016-10-31),See below the head of my Rmd

---

title: "Analyse Helminthosporiose Camargue 2018"
author: "Mathias Frontini"
date: "7 fevrier 2019"
output:
  html_document: default
  
---

```{r setup, include=FALSE}
knitr::opts_chunk$set(echo = TRUE)
```
#Nb de lésions et pourcentage nécrosé

## Insertion et travail du tableau 
```{r 1}
remove (list=ls())
directory="D:/Mes Donnees/manips/C_Camargue/NIS/analyse_helminto/lesion"
setwd(directory)
```

[cderv]

R 3.3.2 is an old version. You may have an old version of yaml

eval.expr appeared in 2.1.19
See https://cran.r-project.org/web/packages/yaml/ChangeLog

You must have a version of yaml that correspond to the one that knitr needs. knitr 1.21 needs yaml >= 2.1.19 (see cran page)

Can you check the version of your ?
Can you upgrade all your components ?

You'll need to get the correct version otherwise. The CRAN time machine for MRAN could help get the at the date of 3.3.2

[mfrontini]

It works !! Indeed it was a R version problem

Thanks a lot