Anybody seen this before?

This problem is driving me crazy.  I've ruled out both firewall issues 
and db version compatibility between the RMAN and target db.  Regular NB 
cold backups work fine.  Im not a DBA so I am struggling through this. 
The entire instance backs up just fine over an hour plus then this error 
is generated just prior to deleting archive logs, I think, and NB errors 
out with a 23 error.  thanks in advance for any pointers!

---snip---
RMAN-08525: backup set complete, elapsed time: 00:00:50
RMAN-03026: error recovery releasing channel resources
RMAN-08031: released channel: ch00
RMAN-08031: released channel: ch01
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure during compilation of command
RMAN-03013: command type: partial resync
RMAN-06004: ORACLE error from recovery catalog database: ORA-03113: 
end-of-file
on communication channel
RMAN-06097: text of failing SQL statement: begin dbms_rcvman . resetAll 
; :succe
ss := dbms_rcvman . SUCCESS ; :av
RMAN-06099: error occurred in source file: krmk.pc, line: 9433

RMAN>

Recovery Manager complete.

Script /export/home/oraprod/scripts/hot_database_backup.sh
==== ended in error on Thu May 1 13:32:30 EDT 2003 ====