Error in postscript(....)

Dear R'ers,

I wonder about the reason for the following error message:

Error in postscript(file = paste(getpath(file), getfname(file),
as.character(num),  : 
	X11 fatal IO error: please save work and shut down R

The R process locks completely, it is not possible to save anything.
Thanks for any help
   M. Eger


P.S.:

R.version

_                
platform i686-pc-linux-gnu
arch     i686             
os       linux-gnu        
system   i686, linux-gnu  
status                    
major    1                
minor    2.1              
year     2001             
month    01               
day      15               
language R

+-------------------------------------------------------
| Marcus Eger
+-------- ><> -------------------------------------------
| E-Mail: eger.m at gmx.de (NEW)
|         marcus.eger at physik.uni-marburg.de (OLD)
| WWW:    http://neuro.physik.uni-marburg.de/~eger (NEW)
+--------------------------------------------------------
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