From owner-freebsd-questions  Tue May 20 16:57:21 1997
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Date: Tue, 20 May 1997 16:56:43 -0700
To: Bryce Newall <data@ds9.abac.com>
From: Steve Caine <shc@cfg.com>
Subject: Re: unknown class 'root'
Cc: FreeBSD Questions List <freebsd-questions@FreeBSD.ORG>
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At 06:57 97/05/20 -0700, Bryce Newall wrote:
>My log files have been filling up with these ever since I upgraded to
>2.2.2-RELEASE ... any idea what they are and how to get rid of 'em?
>Thanks!
>
>May 20 01:45:52 voyager inetd[17471]: login_getclass: unknown class 'root'
>[...]

You need to have an /etc/login.conf file.  You can

  cp -p /usr/src/etc/login.conf /etc

or look at the login.conf man page & construct one from scratch.

Steve.