I typed in the command and then went on application manager. All the catalogues were there. I checked the log and got this information:

hildon-application-manager 2.2.72
connected to 3bde2919-84b8-4e57-b844-62a1f8d8e911
W: Conflicting distribution: http://repository.maemo.org fremantle-1.3 Release (expected fremantle-1.3 but got )
W: GPG error: https://downloads.maemo.nokia.com ./ Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY ADB4438160A655EF


I then closed the manager and when i opened it, the same problem occured again- everything was gone.