Error(s) in re-building vignettes:
--- re-building ‘datatable-benchmarking.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Error: processing vignette 'datatable-benchmarking.Rmd' failed with diagnostics:
there is no package called 'stringi'
--- failed re-building ‘datatable-benchmarking.Rmd’

--- re-building ‘datatable-faq.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Error: processing vignette 'datatable-faq.Rmd' failed with diagnostics:
there is no package called 'stringi'
--- failed re-building ‘datatable-faq.Rmd’

--- re-building ‘datatable-importing.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Error: processing vignette 'datatable-importing.Rmd' failed with diagnostics:
there is no package called 'stringi'
--- failed re-building ‘datatable-importing.Rmd’

--- re-building ‘datatable-intro.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Error: processing vignette 'datatable-intro.Rmd' failed with diagnostics:
there is no package called 'stringi'
--- failed re-building ‘datatable-intro.Rmd’

--- re-building ‘datatable-keys-fast-subset.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Error: processing vignette 'datatable-keys-fast-subset.Rmd' failed with diagnostics:
there is no package called 'stringi'
--- failed re-building ‘datatable-keys-fast-subset.Rmd’

--- re-building ‘datatable-reference-semantics.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Error: processing vignette 'datatable-reference-semantics.Rmd' failed with diagnostics:
there is no package called 'stringi'
--- failed re-building ‘datatable-reference-semantics.Rmd’

--- re-building ‘datatable-reshape.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Error: processing vignette 'datatable-reshape.Rmd' failed with diagnostics:
there is no package called 'stringi'
--- failed re-building ‘datatable-reshape.Rmd’

--- re-building ‘datatable-sd-usage.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Error: processing vignette 'datatable-sd-usage.Rmd' failed with diagnostics:
there is no package called 'stringi'
--- failed re-building ‘datatable-sd-usage.Rmd’

--- re-building ‘datatable-secondary-indices-and-auto-indexing.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Error: processing vignette 'datatable-secondary-indices-and-auto-indexing.Rmd' failed with diagnostics:
there is no package called 'stringi'
--- failed 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-benchmarking.Rmd’ ‘datatable-faq.Rmd’
  ‘datatable-importing.Rmd’ ‘datatable-intro.Rmd’
  ‘datatable-keys-fast-subset.Rmd’ ‘datatable-reference-semantics.Rmd’
  ‘datatable-reshape.Rmd’ ‘datatable-sd-usage.Rmd’
  ‘datatable-secondary-indices-and-auto-indexing.Rmd’

Error: Vignette re-building failed.
Execution halted