Issue with named service :
When trying to restart named, you get an error stating some parameter is not given correctly in a zone file.
It would be a reverse PTR zone file with name something like this:
Open the zone file using vim ,
# vim /var/named/run-root/var/72.200.xx.in-addr.arpa.db
When you check the file you can see a mis-configuration in a particular line
when compared with other lines. You can easily spot that with your naked eye.
Edit that misconfigured line (check how other lines are written ) and save it and restart
This is a bug which is seen in some older versions of Plesk.