script to maps

Mrs,

I am trying to do a script in NCL for plot a series of maps and he presented
a error informing that could not open more than a workstation pdf at the
same time. How do I do to solve this problem? I would be grateful if you
could help me. I am working with the NCL Version 4.2.0.a034 and the error
is:

 warning:GKS:GOPWK: -- Only one PDF workstation can be open at a time
fatal:Workstation with PID#65 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 2672 in file $NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl
fatal:Execute: Error occurred at or near line 2797 in file
$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl fatal:Execute: Error
occurred at or near line 190 in file rate.ncl fatal:GCLWK:libncarg
Error:NGSETI - Uncleared prior error

Edson.

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