Scheduled TRN Backups Failing (sql2000)

I have created a backup that does once weekly BAK and every night it does TRN backup. This is in the same maintaince plan, the jobs appear as seprate jobs as they should. I have noticed my TRN is always failing, after looking into the event logs i see this.

please note this is lastest time to early:

4:22pm
this is the warning that the event log gives:

SQL Server Scheduled Job 'Transaction Log Backup Job for DB Maintenance Plan 'xxxxxxxx TRN'' (0xB87B2FA07E4FB74CA01A1D38134C9C4F) - Status: Failed - Invoked on: 2007-03-09 16:19:40 - Message: The job failed. The Job was invoked by User domainAdministrator. The last step to run was step 1 (Step 1).


the next is
4:22pm
18265 :
Log backed up: Database: Staging, creation date(time): 2007/01/30(09:35:34), first LSN: 24624:14008:1, last LSN: 24624:14021:1, number of dump devices: 1, device information: (FILE=1, TYPE=DISK: {'f:program filesmicrosoft sql serverMSSQLBACKUPStagingStaging_tlog_200703091622.TRN'}).

last is 4:21pm
18264 :
Database backed up: Database: Staging, creation date(time): 2007/01/30(09:35:34), pages dumped: 93982, first LSN: 24624:14008:2, last LSN: 24624:14018:1, number of dump devices: 1, device information: (FILE=1, TYPE=DISK: {'f:program filesmicrosoft sql serverMSSQLBACKUPStagingStaging_db_200703091618.BAK'}).

So for some very strange reason its running a full backup then a Transactional, for this reason i would say its failing but why is it even doing this backup? the job is only for TRN????

A manual TRN backup works like a treat

Thanks

BRAD