We hv AIX 5.3, with Oracle 10.2, we r running SAP ECC 6.0 on it,
we r facing error to take DB13 backup,
error as fellows :-

BR0530I Cataloging backups of all database files...
BR0278E Command output of 'SHELL=/bin/sh /oracle/PRD/102_64/bin/rman nocatalog':
Recovery Manager: Release 10.2.0.2.0 - Production on Mon Nov 10 18:45:09 2008
Copyright (c) 1982, 2005, Oracle. All rights reserved.
RMAN>
RMAN> connect target *
connected to target database: PRD (DBID=1710262945, not open)
using target database control file instead of recovery catalog
RMAN> **end-of-file**
RMAN>
host command complete
RMAN> 2> 3> 4> 5> 6> 7> 8> 9> 10> 11> 12> 13> 14> 15> 16> 17> 18> 19> 20> 21> 22> 23> 24> 25> 26> 27> 28> 29> 30> 31> 32> 33> 34> 35> 36> 37> 38> 39> 40> 41> 42> 43> 44> 45> 46>
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03009: failure of catalog command on default channel at 11/10/2008 18:45:10
ORA-19564: error occurred writing 8192 bytes at block number 1
ORA-27091: unable to queue I/O
ORA-27041: unable to open file
IBM AIX RISC System/6000 Error: 13: Permission denied
Additional information: 3
RMAN>
Recovery Manager complete.
BR0280I BRBACKUP time stamp: 2008-11-10 18.45.11
BR0279E Return code from 'SHELL=/bin/sh /oracle/PRD/102_64/bin/rman nocatalog': 1
BR0536E RMAN call for database instance PRD failed
BR0280I BRBACKUP time stamp: 2008-11-10 18.45.11
BR0532E Cataloging backups of all database files failed
BR0280I BRBACKUP time stamp: 2008-11-10 18.45.11
BR0307I Shutting down database instance PRD ...
BR0280I BRBACKUP time stamp: 2008-11-10 18.45.17
BR0308I Shutdown of database instance PRD successful
BR0280I BRBACKUP time stamp: 2008-11-10 18.45.17
BR0304I Starting and opening database instance PRD ...
BR0280I BRBACKUP time stamp: 2008-11-10 18.45.25
BR0305I Start and open of database instance PRD successful
BR0056I End of database backup: bdzfomcn.fft 2008-11-10 18.45.11
BR0280I BRBACKUP time stamp: 2008-11-10 18.45.26
BR0054I BRBACKUP terminated with errors

Plz help ASAP