netcdf to grib

Hello netcdfgroup,

I'm using NCEP/NCAR reanalysis-2 data from CDC which are in netcdf format. To 
initialize a numerical model (ARPS) with these data I need them in grib format. 
I've downloaded 'grads' and 'lats4d' and it works fine with the example data. 
But when I try to convert the NCEP/NCAR data I get the following error message:

"GX Package Initialization: Size = 11 8.5
Running in Batch mode
lats4d: Version 1.3 of 16 June 2000
No hardcopy metafile open
All files closed; all defined objects released
All GrADS attributes have been reinitialized
Scanning self-describing file:  shum.spec.2000.nc
SDF file has no discernable X coordinate.
lats4d: cannot open file " shum.spec.2000.nc"
lats4d: error creating grads_grib file shum.grib.grb
lats4d: exiting from GrADS...
No hardcopy metafile open
GX package terminated"

What did I wrong and what do I have to do?
Thank you very much for your help!
Best regards
Katja Trachte
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