YAML error with Rmd when I tri to knit it

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

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 :package: ?
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 :package: at the date of 3.3.2