Oracle designer container problem, please help

Hi,


I installed Oracle Designer 9i and its repository in the database.
When I start an entity-relationship diagram tool -> New diagram, I get a
prompt to select a default container, but the list to choose from is empty.
I try to make a new folder and select it but I can't make the tool to do it.

When entering Repository Object Navigator I also need to select container
and that works very nice.

What do I have to do to make entity relationship diagram?

Sorry to bother you with that probably trivial question.
Thank you in advance.