Error(s) in re-building vignettes:
--- re-building ‘datatable-benchmarking.Rmd’ using rmarkdown
--- finished re-building ‘datatable-benchmarking.Rmd’

--- re-building ‘datatable-faq.Rmd’ using rmarkdown
--- finished re-building ‘datatable-faq.Rmd’

Warning: namespace ‘knitr’ is not available and has been replaced
by .GlobalEnv when processing object ‘<unknown>’
Error in loadVignetteBuilder(pkgdir) : vignette builder 'knitr' not found
Calls: <Anonymous> -> loadVignetteBuilder
Execution halted
Warning: namespace ‘knitr’ is not available and has been replaced
by .GlobalEnv when processing object ‘<unknown>’
Error in loadVignetteBuilder(pkgdir) : vignette builder 'knitr' not found
Calls: <Anonymous> -> loadVignetteBuilder
Execution halted
Warning: namespace ‘knitr’ is not available and has been replaced
by .GlobalEnv when processing object ‘<unknown>’
Error in loadVignetteBuilder(pkgdir) : vignette builder 'knitr' not found
Calls: <Anonymous> -> loadVignetteBuilder
Execution halted
--- re-building ‘datatable-reference-semantics.Rmd’ using rmarkdown
Loading required package: data.table
--- finished re-building ‘datatable-reference-semantics.Rmd’

--- re-building ‘datatable-reshape.Rmd’ using rmarkdown
Loading required package: data.table
--- finished re-building ‘datatable-reshape.Rmd’

--- re-building ‘datatable-sd-usage.Rmd’ using rmarkdown
Loading required package: data.table
--- finished re-building ‘datatable-sd-usage.Rmd’

--- re-building ‘datatable-secondary-indices-and-auto-indexing.Rmd’ using rmarkdown
Loading required package: data.table
--- finished re-building ‘datatable-secondary-indices-and-auto-indexing.Rmd’

rm -rf *.tex *.bbl *.blg *.aux *.out *.toc *.log *.spl *tikzDictionary *.md figure/
rm -rf *.tex *.bbl *.blg *.aux *.out *.toc *.log *.spl *tikzDictionary *.md figure/
SUMMARY: processing the following files failed:
  ‘datatable-importing.Rmd’ ‘datatable-intro.Rmd’
  ‘datatable-keys-fast-subset.Rmd’

Error: Vignette re-building failed.
Execution halted