RMAN-06004: ORACLE error from recovery catalog database: RMAN-20204: translation not started

 Hello all, From time to time nightly RMAN backup fail with the following errors :

RMAN> debug on;
2> backup as compressed backupset incremental level 0 database;
3> crosscheck archivelog all;
4> backup as compressed backupset ARCHIVELOG ALL DELETE INPUT;
5> crosscheck backup;
6> delete noprompt obsolete;
7> delete noprompt backup completed before 'sysdate-90';
8> exit;


BGMISC:         Finished cleanup at 02-SEP-10 [22:47:05.079]
DBGMISC:        EXITED krmice [22:47:05.095] elapsed time [00:00:00:04.953]
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of backup command at 09/02/2010 22:46:59
RMAN-06004: ORACLE error from recovery catalog database: RMAN-20204: translation not started
RMAN-06031: could not translate database keyword
DBGMISC:        ENTERED krmkursr [22:47:05.142]

I found the following  Bug 5581792  which is closed as duplicate of unpublished