unable to start device PNG and unable to open connection to X11 display

Please consult the help page for png.

Hi,

I have installed R on a computational cluster, and am using putty to access
R. Please help on how to solve the problem of saving png files.

png(file="myplot.png", bg="transparent")
Error in X11(paste("png::", filename, sep = ""), width, height, pointsize,
:
       unable to start device PNG
In addition: Warning message:
unable to open connection to X11 display ''

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Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
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unable to start device PNG and unable to open connection to X11 display

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