It would be best if you went to unreal support forums to help you out with unreal issues. When you have your ircd setup and want help around services, then you come here for help (after making sure you're opered in your network).
Unreal forums: forums.unrealircd.org
My guess is that you have those lines in another file than unrealircd.conf or for any other reason your conf file cant read them so it doesnt know what is "clients" and "servers" class. In any case that is not an Anope issue and thus, not to be resolved here.
I hope i helped you, good luck!