I´ve just installed networker 7.4 on an Oracle database 10.1.0.2.0 running on Windows Itanium, the rman script used to backup is basically the same I use for disk backups except for the channel directive:

run {
ALLOCATE CHANNEL tape1 DEVICE TYPE sbt;
BACKUP FULL FORMAT '%s_%p_%t' DATABASE MAXSETSIZE 40G;
sql 'alter system archive log current';
backup archivelog all;
release channel tape1;
}

The problem I'm having is I'm getting this errors:
RMAN-03009: failure of backup command on tape1 channel
ORA-27206: requested file not found in media management catalog

It appears as if something is actually being backup up since the tape grows at about 60%

I tried resyncing the rman catalog wothout any luck, the backup is being made with the database up but in a time period in which there is no users, I even made a disk backup on the same time period and it went smoothly.

Can somebody shed some light on resolving this matter?