warning:GKS:GOPWK: --X driver error: error opening display

Dear NCL users,
Could anyone give me help how to solve the following errors given below.
thanks,
kalim
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 University Corporation for Atmospheric Research
 NCAR Command Language Version 6.0.0
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warning:GKS:GOPWK: --X driver error: error opening display
warning:GKS:GESC: --SPECIFIED WORKSTATION IS NOT OPEN
fatal:Workstation with PID#8 is not open
fatal:Unable to open Workstation-Can't Create
fatal:Unable to access object with id:-4
fatal:_NhlCreate:Invalid Parent id #-4
fatal:PID #-4 can't be found in NhlSetValues
fatal:NhlGetValues:PID #-4 is invalid
fatal:Execute: Error occurred at or near line 3324 in file $NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl

fatal:Execute: Error occurred at or near line 5672 in file $NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl

fatal:Execute: Error occurred at or near line 37 in file pk.ncl

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Received on Mon Feb 6 01:24:29 2012