Need help urgent... Our disk is getting full

We have veritas netbackup 6.5.1 and have a problem with backup of an Oracle 
datatabas versjon 9i.

We are getting this error in the logfile when running a hot backup of Oracle:

INF - RMAN-03009: failure of backup command on ch00 channel at 04/16/2008 
08:31:52
INF - ORA-19506: fikk ikke opprettet sekvensiell fil, 
navn=arch_ufnjdurin_s2551_p1_t652176983, param=
INF - ORA-27028: skgfqcre: sbtbackup returnerte feil
INF - ORA-19511: Det ble mottatt en feil fra mediestyrerlaget, feiltekst:
INF -    VxBSACreateObject: Failed with error:
INF -    Server Status:  Communication with the server has not been initiated 
or the server status has not been retrieved from the serve

We have two other database on the same server (windows2003) and they are 
running fine with hot backup.

Do you any suggestion on how to solve this? Oracle says it's a netbackup 
error...

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