Only one PDF workstation can be open at a time

Hi

I get the error message that only pdf file can be open at a time. I looked
it up and the suggestion I found online was to write pdfs in a loop. I did
that but it didn't help either.

warning:GKS:GOPWK: -- Only one PDF workstation can be open at a time
fatal:Workstation with PID#55 is not open
 ERROR 3 IN NGSETI - value for WO must reference an open workstation.
 ERROR 1 IN NGSETI - Uncleared prior error
 ERROR 1 IN NGSETI - Uncleared prior error
 ERROR 1 IN NGSETI - Uncleared prior error
 ERROR 1 IN NGSETI - Uncleared prior error
 ERROR 1 IN NGSETI - Uncleared prior error
fatal:Unable to open Workstation-Can't Create
fatal:Unable to access object with id:-4
fatal:NhlGetValues:PID #-4 is invalid
fatal:Execute: Error occurred at or near line 3574 in file
$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl
fatal:Execute: Error occurred at or near line 3800 in file
$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl
fatal:Execute: Error occurred at or near line 46 in file sal_00.ncl

Could you please take a look at my code and suggest the way I can fix that?
Thanks

load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/contributed.ncl"

begin

f= addfile ("/import/c/w/asemenov/CESM_plots/model_out/ocn_year_ave.nc","r")
g=addfile
("/import/c/w/asemenov/CESM_plots/obs/PHC2_TEMP_gx1v6_ann_avg.nc","r")

  pwv2 = g->TEMP
  pwv1 = f->TEMP(0,:,:,:)
printVarSummary(pwv2)
printVarSummary(pwv1)

do i=0,59
pwv = pwv1(i,:,:)-pwv2(i,:,:)

z1 = f->z_t
z=z1/100
  print(z)
  printVarSummary(pwv)
  lat2d = f->TLAT ; read in 2D lat/lon
  lon2d = f->TLONG
  pwv@lon2d = lon2d ; assign required
attributes
  pwv@lat2d = lat2d
  printMinMax (pwv, True)

wks = gsn_open_wks("pdf","plot"+i)
  gsn_define_colormap(wks,"BlWhRe")

  res = True
  res@gsnFrame = True ; So we can draw markers
  res@gsnMaximize = True

  res@gsnSpreadColors = True
  res@cnMinLevelValF = 25
  res@cnMaxLevelValF = 35
        res@mpGridLineDashPattern = 1
        res@mpGeophysicalLineColor = "Black"
        res@mpGeophysicalLineThicknessF = 1.5
        res@cnFillOn = True

        res@mpGridLatSpacingF = 30.
        res@mpGridLonSpacingF = 30.
        res@mpOutlineOn = True
        res@tiMainOn = True
        res@tiMainPosition = "Center"
        res@tiMainFontHeightF = 0.025
        res@lbLabelFontHeightF = 0.02
        res@lbLabelAutoStride = True
        res@lbOrientation = "Vertical"
        res@lbLabelFontHeightF = 0.025

        res@gsnPolarLabelDistance = 1.08
        res@gsnPolarLabelFontHeightF= 0.02
        res@gsnLeftString = " "
        res@gsnRightString = " "

  res@cnLinesOn = False

  res@gsnSpreadColor = True ; color to start
  res@cnLevelSelectionMode = "ManualLevels" ; manually set the contour
levels with the following 3 resources
  res@cnMinLevelValF = -3 ; set the minimum contour level
  res@cnMaxLevelValF = 3 ; set the maximum contour level
  res@cnLevelSpacingF = 0.4 ; set the interval between contours
res@mpProjection = "Stereographic"
        res@mpLimitMode = "Corners"
        res@mpLeftCornerLatF = 41.0
        res@mpLeftCornerLonF = 140.8014
        res@mpRightCornerLatF = 53.0
        res@mpRightCornerLonF = -50.0
        res@mpCenterLatF = 90
        res@mpCenterLonF = -180

 res@mpFillOn = True

  res@tiMainString = "POP2-simulated temp at depth "+z(i)+"m"
  map = gsn_csm_contour_map(wks,pwv(:,:),res)

end do
end

-- 
regards
*******************************************************
*Alex Semenov*
*
*
PhD Student - Research Assistant
International Arctic Research Center
Department of atmospheric sciences
University of Alaska Fairbanks
930 Koyukuk dr, 408c3
Fairbanks, AK, USA, 99775
work phone +19074742672

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Received on Fri Jan 4 15:34:00 2013