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When using R Markdown, R Studio warned me the following message : "Rendering R Markdown documents requires an updated version of the yaml package". So I installed the latest version of the package yaml (2.2.0). But since then, I cannot knit any document in Rmarkdown (even the template or documents that were working just fine before).

I tried downloading older versions of yaml but I get the same message as at the beginning ("requires an updated version").

When I knit a document, I get the following error : 

Error in yaml::yaml.load(..., eval.expr = TRUE) : 
  unused argument (eval.expr = TRUE)
Calls: <Anonymous> ... parse_yaml_front_matter -> yaml_load -> <Anonymous>
Anthon
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Clemence Aile
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  • Maybe the following can help you: [Link](https://stackoverflow.com/questions/51553603/error-in-yaml-with-r-markdown?rq=1). – KoenV Jan 08 '19 at 10:03

1 Answers1

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I had the unused argument (eval.expr = TRUE) problem after updating RStudio. Somehow it messed up with the R installation and an .Rmd that worked before, stopped working with that error.

What did the trick for me was removing yaml and installing it again.

> remove.packages("yaml")
> install.packages("yaml")
>
manuelvigarcia
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