RMAN-10011: synchronization error while polling for rpc 8, action=startdefa

Question

Could anybody explain what is this error message caused by?
TIA
The entire spool below:
051107064744: NetBackup RMAN Backup Started
ORACLE_SID=db02
backup_type=cold
number_of_channels=2
Started by: Oracle
051107064745: Checking database status
051107064745: Database status: OPEN
051107064745: Getting database password
051107064746: Checking database password
051107064746: Database password: Valid
051107064746: Checking Database mode
051107064746: Database mode: NOARCHIVELOG
051107064746: Shutdown no archive
051107064838: RMAN BACKUP STARTED
Recovery Manager: Release 10.1.0.4.0 - 64bit Production
Copyright (c) 1995, 2004, Oracle. All rights reserved.
connected to target database: db02 (DBID=3504436532)
RMAN> connect catalog *
2> run
3> {
4> sql 'alter session set sort_area_size=12582912';
5> sql 'alter session set sort_area_retained_size=1048576';
6> allocate channel t1 type 'SBT_TAPE' parms="ENV=(NB_ORA_POLICY=ORA_solcdi02, NB_ORA_SERV=sun4)"
7> format 'df_%d_%p_%u_%t';
8> set limit channel t1 maxopenfiles=1;
9> allocate channel t2 type 'SBT_TAPE' parms="ENV=(NB_ORA_POLICY=ORA_solcdi02, NB_ORA_SERV=sun4)"
10> format 'df_%d_%p_%u_%t';
11> set limit channel t2 maxopenfiles=1;
12> backup database filesperset=64
13> include current controlfile;
14> sql 'alter database open';
15> release channel t1;
16> release channel t2;
17> }
18>
connected to recovery catalog database
starting full resync of recovery catalog
full resync complete
sql statement: alter session set sort_area_size=12582912
sql statement: alter session set sort_area_retained_size=1048576
allocated channel: t1
channel t1: sid=160 devtype=SBT_TAPE
channel t1: VERITAS NetBackup for Oracle - Release 5.1 (2004122521)
allocated channel: t2
channel t2: sid=159 devtype=SBT_TAPE
channel t2: VERITAS NetBackup for Oracle - Release 5.1 (2004122521)
Starting backup at 11-MAY-07
channel t1: starting full datafile backupset
channel t1: specifying datafile(s) in backupset
input datafile fno=00005 name=/oradata/10gid/u01/grid102/grid102/mgmt.dbf
input datafile fno=00006 name=/oradata/10gid/u01/grid102/grid102/mgmt_ecm_depot1.dbf
input datafile fno=00007 name=/oradata/10gid/u01/grid102/grid102/system02.dbf
input datafile fno=00004 name=/oradata/10grid/u01/grid102/grid102/users01.dbf
channel t1: starting piece 1 at 11-MAY-07
channel t2: starting full datafile backupset
channel t2: specifying datafile(s) in backupset
input datafile fno=00008 name=/oradata/10ggrid/u01/grid102/grid102/mngmecm02.dbf
input datafile fno=00001 name=/oradata/10ggrid/u01/grid102/grid102/system01.dbf
input datafile fno=00002 name=/oradata/10ggrid/u01/grid102/grid102/undotbs01.dbf
input datafile fno=00003 name=/oradata/10ggrid/u01/grid102/grid102/sysaux01.dbf
channel t2: starting piece 1 at 11-MAY-07
channel t2: finished piece 1 at 11-MAY-07
piece handle=df_GRID102_1_19ihecmm_622277334 comment=API Version 2.0,MMS Version 5.0.0.0
channel t2: backup set complete, elapsed time: 00:06:05
channel t2: starting full datafile backupset
channel t2: specifying datafile(s) in backupset
including current controlfile in backupset
channel t2: starting piece 1 at 11-MAY-07
channel t2: finished piece 1 at 11-MAY-07
piece handle=df_GRID102_1_1aihed24_622277700 comment=API Version 2.0,MMS Version 5.0.0.0
channel t2: backup set complete, elapsed time: 00:00:35
channel t1: finished piece 1 at 11-MAY-07
piece handle=df_GRID102_1_18ihecmm_622277334 comment=API Version 2.0,MMS Version 5.0.0.0
channel t1: backup set complete, elapsed time: 00:06:48
Finished backup at 11-MAY-07
Starting Control File and SPFILE Autobackup at 11-MAY-07
piece handle=c-3404436532-20070511-00 comment=API Version 2.0,MMS Version 5.0.0.0
Finished Control File and SPFILE Autobackup at 11-MAY-07
sql statement: alter database open
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-10010: error while checking for RPC completion
RMAN-10011: synchronization error while polling for rpc 8, action=startdefault
Recovery Manager complete.
051107065708: RMAN BACKUP FAILED, RMAN exit status=1
051107065708: Cleaning log file (removing passwords)
051107065709: Error Log Check
051107065837: Rman Stat Generator
051107065956: Backup Html Generator
051107065956: NetBackup RMAN Backup Finished
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Answer 1

Check on metalink:
RMAN-10011: synchronization error while polling for rpc 3, action=startdefault
Note:429572.1
Werner