[BioC] X11 problem

[D.Enrique ESCOBAR ESPINOZA]

i m running R in a fedora core 5 x86 server wothout 
X11 service.
X11 is the default device for R
So when I m drawing png images,
I receive this error output
>>>>>>>>>>>>>>>
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 ''
Execution halted
>>>>>>>>>>>>>>>>
How can I do for drawing png without starting X11 which isn installed
in my server?

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D.Enrique ESCOBAR ESPINOZA
(DESS Bioinfomatique
B.Sc. Biologie Moleculaire
Certificat Informatique)
http://adn.bioinfo.uqam.ca/~escd07097301/
http://spaces.msn.com/members/escobarebio/
ICQ#: 201778618
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Tel: (514) 690-8398
Montreal QC Canada