hwrf_products task on Jet

Hi,

One of cycle I ran from 2019 08L has been failing. I found the following error message in the logfile.

10/26 14:14:22.696 hwrf.regribber [regrib4] (gribtask.py:628) WARNING: p123_synop 20190913.180000: failed with exception list index out of range

From gabrielle08l.2019090918.trak.hwrf.raw in the com directory, the problem should be for the 42th forecast hour.

Advice needed as I am unsure what is the cause.

Thanks

Agnes