Can't use clob and blob

I just created a new database using dbca with General Purpose as the template, as I've done before. All went well until I tried to create tables that used clob or blob datatypes. I kept getting the error "ORA-03001: unimplemented feature".
What happened? Was the database created improperly? Is there a way to correct this without recreating the database?
Thanks

I just created a new database using dbca with General
Purpose as the template, as I've done before. All
went well until I tried to create tables that used
clob or blob datatypes. I kept getting the error
"ORA-03001: unimplemented feature".
I have the same problem but only if I assign a tablespace to the table but not if i leave it to the default tablespace.

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