question about 'za' unrecognized argument -grid_file

Hi,
I have downloaded the diagnostic package-- popdiag_rel_20121121 and changed related roots.When I run the popdiag.csh, it shows: "no monthly files exist...cannot create climatology
 ERROR : unrecognized argument -grid_file
 USAGE : za [OPTION]... infilename.nc"options :
  -h|-help (print this help message)
  -o outfilename [default: za_infilename.nc]
  -time_const (apply averaging to time constant fields)
  -A (if outfilename exists, append to it)
  -O (if outfilename exists, overwrite it)
  -N (no normalization, i.e. compute area sums as opposed to area averages)
  -v var1[,var2[...]] variables to process
  -x process all variables EXCEPT those specified with -v
  -rmask_file filename [default: infilename.nc]
but, the popdiag.csh code include this '-grid_file' choice: if ($SWIFT == 0) then
187     za -O -time_const -grid_file $gridfile $TAVGFILEDo you have any advice?THANKS! 
 
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