Error(s) in re-building vignettes:
--- re-building ‘Computer_Capacity.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
--- finished re-building ‘Computer_Capacity.Rmd’

--- re-building ‘Extended_Installation_Guide.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
--- finished re-building ‘Extended_Installation_Guide.Rmd’

--- re-building ‘Pre-registration.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
--- finished re-building ‘Pre-registration.Rmd’

--- re-building ‘Removing_Cache_Files.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
--- finished re-building ‘Removing_Cache_Files.Rmd’

--- re-building ‘Word_embeddings.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
--- finished re-building ‘Word_embeddings.Rmd’

--- re-building ‘text.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
[0;34mThis is text (version 0.9.10). 
[0m[0;32mText is new and still rapidly improving. 
Newer versions may have improved functions and updated defaults to reflect current understandings of the state-of-the-art. 
Please send us feedback based on your experience.[0m
Warning in grid.Call(C_textBounds, as.graphicsAnnot(x$label), x$x, x$y,  :
  no font could be found for family "Arial"
Warning in grid.Call(C_textBounds, as.graphicsAnnot(x$label), x$x, x$y,  :
  no font could be found for family "Arial"
Quitting from lines 110-132 (text.Rmd) 
Error: processing vignette 'text.Rmd' failed with diagnostics:
polygon edge not found
--- failed re-building ‘text.Rmd’

SUMMARY: processing the following file failed:
  ‘text.Rmd’

Error: Vignette re-building failed.
Execution halted