Export/import using Enterprise Manager

Hi all,
I trying to exp/imp a table using OEM 10g, but it gives me the following error: "La aplicación necesita más privilegios de base de datos de los que tiene otorgados actualmente. Haga clic en Ayuda para obtener información especÃ*fica sobre la versión.", that means that I need some more privileges.
In the command line I can exp/imp the same table succesfully.

Which privileges do I need?

Thanx all.

can you translate that into english?

And provide: OS and Error#

Are you using Client EM console or Web EM console?

:confused:

Are you logging in to OEM as SYSTEM user?