You are obviously using oscam-trunk, which was bugged in 11533 and 11534.
The only relevant change you made was adding "boxtype = dreambox", which avoided the bug.
And yes, of course you need to configure oscam yourself, whatever oscam you get, it can't know what cards or cardservers you have.
Even oscam-smod, which can operate totally configless as long as you only use the emulator and/or local cards, can only do so until proxies (cardservers) need to be added.