I guess I did not make myself clear in the first try. Here we go again:

I came across the problem when I was trying to create Recovery Catalog. To set up Recovery Catalog, Oracle suggests the following:
1. create a tablespace for the recovery catalog
2. create recovery manager user
3. grant recovery_catalog_owner role to rman
4. Garnt DBA privileges to rman user
5. create neccessary tables for the recovery catalog by running catrman.sql script under ORACLE_HOME/rdbms/admin

Step 5 is where the problem was initiated. Any suggestions?

Thanks.