R Markdown cannot Knit HTML; YAML Error

[cderv]

This is an issue with version of yaml and version of knitr. You need 2 version compatible with each other. Either upgrade everything or choose your version.

See this answer for details

YAML error with Rmd when I tri to knit it

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