Archive log backup error and backup completed with errors My prod DB backup completed with errors stating the below error.

RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03009: failure of backup command on ch01 channel at 05/08/2014 09:24:07
ORA-19588: archived log recid 161391 stamp 907826104 is no longer valid


What to do?
This happens when one processes cleans the archives and an other finds the need to backup it. Things to check:

do you have a archive log clean script other than rman? (hope not)
do you run archive log backups during the full database backup? if so, don't make archive backups in the db backup script but only in the archivelog backup script.