Error Message

From: Jaya Pudashine <letterjaya_at_nyahnyahspammersnyahnyah>
Date: Fri May 31 2013 - 09:06:01 MDT

When I was using ncl with following code, it shows following error message,
what is the problem ?

ncl 3> wks=gsn_open_wks("x11","native")
warning:GKS:GOPWK: --X driver error: DISPLAY environment variable not set
fatal:Workstation with PID#8 is not open
fatal:Unable to open Workstation-Can't Create
fatal:Unable to access object with id:-4

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Received on Fri May 31 09:06:15 2013

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