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Problem :

I installed RStudio on Mac OS X, version 10.7.3 but facing following issue.
 error in grid.call(c_textbounds, as.graphicsannot(x$label), x$x, x$y, : polygon edge not found
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1 Answer

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Solution :

I researched alot and i got  solution for your issue. 

Firstly try to run below command to ensure the fonts are existing:

loadfonts(dev="win")

After that need to call the following to ensure the name you are calling is same as R knows:

windowsFonts()

Or else try the following:

library(extrafont)
extrafont::font_import()

The above solution fixed problems for me.

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