DB2 db backups on AIX getting "Script exited with status = 4 "

Nothing more in the Activity Monitor's parent process detail log other than the next line which says "bphdb exit status = 6: the backup failed to back up the requested files".  Any idea where this path to the archive file might be located??

Failed parent process forced a rerun of the backup.  Currently have logging enabled.

This just started happening.  No NetBackup or AIX updates on the applicable LPAR have occurred for several months.

Thanks!