ORA-19502 and RMAN

I am doing an RMAN backup on RHEL 5 of my archivelogs every 10 minutes to keep the mount point from filling up.  

  crosscheck archivelog all;

  backup as compressed backupset archivelog all format='/oracle_backup_<Database>/rman/%U.arc' delete all input;

  delete noprompt obsolete;  

However, I'm getting an ORA-19502 when the database tries to write to the archivelogs that were just backed up.  

RMAN Log:

...

validation succeeded for archived log

archived log file
name=/ora03<database>/arch/<database>_3592_1_726663173.arc RECID=3582 STAMP=735125601
...

Starting backup at 15-NOV-10

current log archived

using channel ORA_DISK_1

using channel ORA_DISK_2

channel ORA_DISK_1: starting compressed archived log backup set

channel ORA_DISK_1: specifying archived log(s) in backup set

...

input archived log thread=1 sequence=3592 RECID=3582 STAMP=735125601

...

channel ORA_DISK_2: starting piece 1 at 15-NOV-10

channel ORA_DISK_2: finished piece 1 at 15-NOV-10

piece handle=/oracle_backup_<database>/rman/a2lt286f_1_1.arc tag=TAG20101115T093509 comment=NONE

channel ORA_DISK_2: backup set complete, elapsed time: 00:02:45

channel ORA_DISK_2: deleting archived log(s)

...

archived log file
name=/ora03<database>/arch/<database>_3592_1_726663173.arc RECID=3582 STAMP=7351256   Alert Log Error:  

ORA-19502: write error on file
/ora03<database>/arch/<database>_3592_1_726663173.arc, block number 12289 (block size=512)    

Any idea why Oracle would be trying to write to an archivelog that RMAN has just backed up and deleted? I did a list backup of archivelog x and can see that it was indeed backed up.    

Thank you,  

WGB  

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