Error(s) in re-building vignettes:
--- re-building ‘BarChart.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Quitting from lines 225-226 (BarChart.Rmd) 
Error: processing vignette 'BarChart.Rmd' failed with diagnostics:
polygon edge not found
--- failed re-building ‘BarChart.Rmd’

--- re-building ‘Customize.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 ‘Customize.Rmd’

--- re-building ‘Extract.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 ‘Extract.Rmd’

--- re-building ‘FactorAnalysis.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 ‘FactorAnalysis.Rmd’

--- re-building ‘Histogram.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Quitting from lines 83-84 (Histogram.Rmd) 
Error: processing vignette 'Histogram.Rmd' failed with diagnostics:
polygon edge not found
--- failed re-building ‘Histogram.Rmd’

--- re-building ‘Means.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 ‘Means.Rmd’

--- re-building ‘Plot.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Quitting from lines 90-91 (Plot.Rmd) 
Error: processing vignette 'Plot.Rmd' failed with diagnostics:
polygon edge not found
--- failed re-building ‘Plot.Rmd’

--- re-building ‘Proportions.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 ‘Proportions.Rmd’

--- re-building ‘ReadWrite.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 ‘ReadWrite.Rmd’

--- re-building ‘Regression.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 ‘Regression.Rmd’

--- re-building ‘pivot.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 ‘pivot.Rmd’

--- re-building ‘utilities.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 ‘utilities.Rmd’

SUMMARY: processing the following files failed:
  ‘BarChart.Rmd’ ‘Histogram.Rmd’ ‘Plot.Rmd’

Error: Vignette re-building failed.
Execution halted