Media Manager error when using RMAN after backup change to disk

[tklinz2001]

We recently changed the Oracle backup location to an external disk share instead of the same machine that the database is located on. I made the change within EM specifying the backup location under disk backup location.
The backup runs fine, but my problem is when using RMAN. Whenever I try and connect using RMAN and do something simple like report obsolete, I receive the following error:
ORA-19554: error allocating device, device type: SBT_TAPE, device name:
ORA-27211: Failed to load Media Management Library

Is there something separate that needs to be installed or linked for managing the backups on a separate share?
Oracle is 10g
Servers are Win 2003

Thanks in advance

 

[karluk]

My guess is that the configuration you did in EM to get the backups written to the external disk has changed your default device type from disk to sbt_tape. If so, you should be able to change this for the duration of your rman session by explicitly overriding the default via the command

ALLOCATE CHANNEL FOR MAINTENANCE DEVICE TYPE DISK;