Running R 1.9.1 under red hat 2.1 version

When I try to generate an image, we get an error as in the following

plot(rnorm(100))
Error in PS(file, old$paper, old$family, old$encoding, old$bg, old$fg,  : 
        unable to start device PostScript
In addition: Warning message: 
cannot open `postscript' file argument `Rplots.ps'

If anyone can throw some light or any pointers into why we are facing this problem then it would be really helpful. 

Thanks,
Sandeep.

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