[BioC] qrqc with error message of "unable to start device PNG" and "unable to open connection to X11 display"?

Sang Chul Choi schoi at cornell.edu
Tue May 29 22:46:51 CEST 2012


I am trying to use qrqc Bioc package in a linux machine used as a compute node.  I have the following error:

Error in X11(paste("png::", filename, sep = ""), g$width, g$height, pointsize,  : 
  unable to start device PNG
In addition: Warning message:
In grDevices::png(..., width = width, height = height, res = dpi,  :
  unable to open connection to X11 display ''

I have googled for an answer and bumped into following mailing list posts:


It is not obvious what I should do. I will appreciate your answers.

Thank you,


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