Could you give the exact error message?
These may help:
http://www.slackfiles.net/documentat...cles/init.html
http://linuxtipps.sourceforge.net/sh.../en/faq/56.htm
as datadriven suggests, you may as well get your head around the rc.d style init way of doing things if you use slack, it is actually much simpler once you get used to it.
Coming from Mandrake etc, it seems slightly archaic, but now I wouldn't be without it.
Kde supplies the sysV editor as standard, but it doesn't really have a useful role in Slackware. Saying that, you should read the note in /etc/rc.d/rc.sysvinit
However I am not convinced that your error is related to any of this, could you clarify what is wrong?