Error(s) in re-building vignettes:
--- re-building ‘graph_packing.Rmd’ using rmarkdown
--- finished re-building ‘graph_packing.Rmd’

--- re-building ‘intro.Rmd’ using rmarkdown
Quitting from lines 150-172 (intro.Rmd) 
Error: processing vignette 'intro.Rmd' failed with diagnostics:
polygon edge not found
--- failed re-building ‘intro.Rmd’

--- re-building ‘progressive_packing.Rmd’ using rmarkdown
Warning in grid.Call.graphics(C_text, as.graphicsAnnot(x$label), x$x, x$y,  :
  no font could be found for family "Arial"
Warning in grid.Call.graphics(C_text, as.graphicsAnnot(x$label), x$x, x$y,  :
  no font could be found for family "Arial"
Warning in grid.Call.graphics(C_text, as.graphicsAnnot(x$label), x$x, x$y,  :
  no font could be found for family "Arial"
Warning in grid.Call.graphics(C_text, as.graphicsAnnot(x$label), x$x, x$y,  :
  no font could be found for family "Arial"
Warning in grid.Call.graphics(C_text, as.graphicsAnnot(x$label), x$x, x$y,  :
  no font could be found for family "Arial"
Warning in grid.Call.graphics(C_text, as.graphicsAnnot(x$label), x$x, x$y,  :
  no font could be found for family "Arial"
Warning in grid.Call.graphics(C_text, as.graphicsAnnot(x$label), x$x, x$y,  :
  no font could be found for family "Arial"
Warning in grid.Call.graphics(C_text, as.graphicsAnnot(x$label), x$x, x$y,  :
  no font could be found for family "Arial"
Warning in grid.Call.graphics(C_text, as.graphicsAnnot(x$label), x$x, x$y,  :
  no font could be found for family "Arial"
Warning in grid.Call.graphics(C_text, as.graphicsAnnot(x$label), x$x, x$y,  :
  no font could be found for family "Arial"
Warning in grid.Call.graphics(C_text, as.graphicsAnnot(x$label), x$x, x$y,  :
  no font could be found for family "Arial"
Warning in grid.Call.graphics(C_text, as.graphicsAnnot(x$label), x$x, x$y,  :
  no font could be found for family "Arial"
Warning in grid.Call.graphics(C_text, as.graphicsAnnot(x$label), x$x, x$y,  :
  no font could be found for family "Arial"
Warning in grid.Call.graphics(C_text, as.graphicsAnnot(x$label), x$x, x$y,  :
  no font could be found for family "Arial"
Warning in grid.Call.graphics(C_text, as.graphicsAnnot(x$label), x$x, x$y,  :
  no font could be found for family "Arial"
Warning in grid.Call.graphics(C_text, as.graphicsAnnot(x$label), x$x, x$y,  :
  no font could be found for family "Arial"
Warning in grid.Call.graphics(C_text, as.graphicsAnnot(x$label), x$x, x$y,  :
  no font could be found for family "Arial"
Warning in grid.Call.graphics(C_text, as.graphicsAnnot(x$label), x$x, x$y,  :
  no font could be found for family "Arial"
Warning in grid.Call.graphics(C_text, as.graphicsAnnot(x$label), x$x, x$y,  :
  no font could be found for family "Arial"
Warning in grid.Call.graphics(C_text, as.graphicsAnnot(x$label), x$x, x$y,  :
  no font could be found for family "Arial"
Warning in grid.Call.graphics(C_text, as.graphicsAnnot(x$label), x$x, x$y,  :
  no font could be found for family "Arial"
Quitting from lines 98-125 (progressive_packing.Rmd) 
Error: processing vignette 'progressive_packing.Rmd' failed with diagnostics:
polygon edge not found
--- failed re-building ‘progressive_packing.Rmd’

SUMMARY: processing the following files failed:
  ‘intro.Rmd’ ‘progressive_packing.Rmd’

Error: Vignette re-building failed.
Execution halted