knitr: getting a parse_all error in R when converting Rmd file into HTML

Question

I am getting below Parsing error each time I use Knit Html in R for converting my Rmd files into HTML:

Error in parse_all(input, filename, stop_on_error != 2L) : unused argument (stop_on_error != 2) Calls: ... call_block -> block_exec -> in_dir -> evaluate -> parse_all

Execution halted

Same result is obtained when using knitr or knitr:knit2html from the command line. Error did not exist before (I have already used Knit HTML for many .Rmd reports) but appeared when I used knit2html from the cmd for the first time. The compilation is only working where there are no R code chunks in the .Rmd file or when the chunks are empty. I work under windows 7, R version: 3.2.3, R studio version: 0.99.902. Below is the only R code chunk in the test.Rmd file that I am using for testing:

```{r}
i <- 0
i < i + 3
i
```

there is a nearly identical (but now deleted, so invisible to low-rep users) question at stackoverflow.com/questions/37239317/… ... I wonder if some piece of infrastructure is (probably temporarily) broken? — Ben Bolker
aargh I have the same. It started when I updated the knitr package. If only I had read your question before... Is there a way to revert the updates? — Vincent
My guess is your version of the evaluate package is too old. Please see FAQ1: github.com/yihui/knitr/blob/master/FAQ.md — Yihui Xie
Had the same issue, and it fixed it by updating the evaluate package. — eflores89
Same for me, upgraded evaluate from version 0.8 to version 0.9 and the problem went away. — Nicholas Hamilton

userJT userJT · Accepted Answer · 2016-08-01T20:29:06

After seeing the same error, the following (updating evaluate package) helped me

install.packages("evaluate")

Evaluate is used by knitr. Here is a link to CRAN about evaluate: https://cran.rstudio.com/web/packages/evaluate/index.html

My R version is 3.2.4. There is no need to do any complicated re-installs. Try this first.

knitr: getting a parse_all error in R when converting Rmd file into HTML

3 Answers