r - Error in grid.Call(L_textBounds, as.graphicsAnnot(x$label), x$x, x$y, : Polygon edge not found

Question

I just installed RStudio on Mac OS X, version 10.7.3. After executing the following commands

library(ggplot2)
qplot(mpg, wt, data=mtcars)

I get the following error:

Error in grid.Call(L_textBounds, as.graphicsAnnot(x$label), x$x, x$y,  : 
  Polygon edge not found
In addition: Warning messages:
1: In grid.Call(L_textBounds, as.graphicsAnnot(x$label), x$x, x$y,  :
  no font could be found for family "Arial"
2: In grid.Call(L_textBounds, as.graphicsAnnot(x$label), x$x, x$y,  :
  no font could be found for family "Arial"

How do I fix this?

Answer 1

this happened to me and i discovered that the arial font file had been disabled. first check to see if Arial.ttf has been moved to the disabled fonts directory. from the terminal:

ls /Library/Fonts Disabled

if so, move it back to the active fonts directory.

sudo mv /Library/Fonts Disabled/Arial.ttf /Library/Fonts

log out, log in, then open the 'Font Book' application. in my case, arial was present before hand, but it was the Microsoft version stored in /Library/fonts/Microsoft/. Font Book may now show a yellow triangle next to the font name, indicating that multiple copies of the font exist. highlight the font name and chose the Resolve Duplicates command from the Edit menu. this should disable the Microsoft copy, which you can confirm by selecting one of the arial type faces (click the expand triangle next to the font name), right-click on the one labelled Off, and choose Reveal in Finder, which should open a window to Microsoft fonts directory.