No slapd. Says the same thing as slap. I don't think it is installed.i think it's usually called slapd on most distros - try service slapd stop
I fixed this problem. I was using my own DNS system on a local server. This is so I can test Zimbra.make sure you have mx record set for the domain test.com
I went though my services and didn't see anyone of them running. After I got the DNS working the error didn't come back up.you've already got a conflicting mta running - try shutting down existing sendmail/qmail/exim/postfix instances. ditto for existing openldap, cyrus/courier etc
So I am still at my problem with slapd. I am going to look on the internet for it and download and install it.