Oracle 8 connect agent using RMAN

ADSM Server 3.1.2.40 on AIX 4.2
Oracle 8.0.5

Myself and our DBA are trying to get the Oracle Connect Agent to work. We are 
making progress, but have come across the following error, and we are not sure 
if the problem is in Oracle or ADSM.  The command we used when we received this 
error was:

RMAN>run 
2> {
3> allocate channel adsm type 'SBT_TAPE' 
4> parms 'ENV=(DSMI_NODE=BANNER,DSMO_FS=BANNER)';
5> backup full format '%d_%u' (database);
6> }

The following is a screen shot of what the result was (there were other 
datafiles before #10, just not on screen to copy):

*****************
RMAN-08010: channel adsm: including datafile 10 in backupset
RMAN-08010: channel adsm: including datafile 3 in backupset
RMAN-08010: channel adsm: including datafile 1 in backupset
RMAN-08011: channel adsm: including current controlfile in backupset
RMAN-08010: channel adsm: including datafile 4 in backupset
RMAN-08010: channel adsm: including datafile 5 in backupset
RMAN-03026: error recovery releasing channel resources
RMAN-08031: released channel: adsm
RMAN-00569: ================error message stack follows================
RMAN-03015: error occurred in stored script adsm_test_backup
RMAN-03007: retryable error occurred during execution of command: backup
RMAN-07004: unhandled exception during command execution on channel adsm
RMAN-10032: unhandled exception during execution of job step 1: ORA-06512: at li
ne 288
RMAN-10035: exception raised in RPC: ORA-19624: operation failed, retry possible
ORA-19506: failed to create sequential file, name="TEST_0ablscj2", parms=""
ORA-27006: sbtremove returned error
Additional information: 7085
Additional information: 1
ORA-06512: at "SYS.DBMS_BACKUP_RESTORE", line 408
RMAN-10031: ORA-19624 occurred during call to DBMS_BACKUP_RESTORE.BACKUPPIECECRE
ATE
*****************

Any ideas?? 

Thanks in advance,

Jeff