Error(s) in re-building vignettes:
--- re-building ‘lognorm.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Warning in grid.Call(C_textBounds, as.graphicsAnnot(x$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$y,  :
  no font could be found for family "Arial"
Warning in grid.Call(C_textBounds, as.graphicsAnnot(x$label), x$x, x$y,  :
  no font could be found for family "Arial"
Quitting from lines 51-78 (lognorm.Rmd) 
Error: processing vignette 'lognorm.Rmd' failed with diagnostics:
polygon edge not found
--- failed re-building ‘lognorm.Rmd’

--- re-building ‘lognormalDiff.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Warning in grid.Call(C_textBounds, as.graphicsAnnot(x$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$y,  :
  no font could be found for family "Arial"
Warning in grid.Call(C_textBounds, as.graphicsAnnot(x$label), x$x, x$y,  :
  no font could be found for family "Arial"
Quitting from lines 89-107 (lognormalDiff.Rmd) 
Error: processing vignette 'lognormalDiff.Rmd' failed with diagnostics:
polygon edge not found
--- failed re-building ‘lognormalDiff.Rmd’

--- re-building ‘lognormalSum.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Warning in grid.Call(C_textBounds, as.graphicsAnnot(x$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$y,  :
  no font could be found for family "Arial"
Warning in grid.Call(C_textBounds, as.graphicsAnnot(x$label), x$x, x$y,  :
  no font could be found for family "Arial"
Quitting from lines 87-106 (lognormalSum.Rmd) 
Error: processing vignette 'lognormalSum.Rmd' failed with diagnostics:
polygon edge not found
--- failed re-building ‘lognormalSum.Rmd’

SUMMARY: processing the following files failed:
  ‘lognorm.Rmd’ ‘lognormalDiff.Rmd’ ‘lognormalSum.Rmd’

Error: Vignette re-building failed.
Execution halted