Error(s) in re-building vignettes:
--- re-building ‘basic.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
Quitting from lines 38-42 (basic.Rmd) 
Error: processing vignette 'basic.Rmd' failed with diagnostics:
cannot open the connection
--- failed re-building ‘basic.Rmd’

--- re-building ‘colors.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
Quitting from lines 38-40 (colors.Rmd) 
Error: processing vignette 'colors.Rmd' failed with diagnostics:
cannot open the connection
--- failed re-building ‘colors.Rmd’

--- re-building ‘combinationModes.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
Quitting from lines 53-55 (combinationModes.Rmd) 
Error: processing vignette 'combinationModes.Rmd' failed with diagnostics:
cannot open the connection
--- failed re-building ‘combinationModes.Rmd’

--- re-building ‘got.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
Quitting from lines 33-34 (got.Rmd) 
Error: processing vignette 'got.Rmd' failed with diagnostics:
cannot open the connection
--- failed re-building ‘got.Rmd’

--- re-building ‘kmap.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
Quitting from lines 28-32 (kmap.Rmd) 
Error: processing vignette 'kmap.Rmd' failed with diagnostics:
cannot open the connection
--- failed re-building ‘kmap.Rmd’

--- re-building ‘venn.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
Quitting from lines 28-32 (venn.Rmd) 
Error: processing vignette 'venn.Rmd' failed with diagnostics:
cannot open the connection
--- failed re-building ‘venn.Rmd’

SUMMARY: processing the following files failed:
  ‘basic.Rmd’ ‘colors.Rmd’ ‘combinationModes.Rmd’ ‘got.Rmd’ ‘kmap.Rmd’
  ‘venn.Rmd’

Error: Vignette re-building failed.
Execution halted