This error means that Plesk attempted to make a DNS change and reload named, but it failed. The problem generally lies within some seemingly innocent RPM's that are causing problems with Plesk's installation of bind.
Check your /var/log/messages for lines like these:
named[xxx]: could not configure root hints from 'named.root': file not found
named[xxx]: loading configuration: file not found
named[xxx]: exiting (due to fatal error)
named: named startup failed
In this case, do a quick check for these RPM's and remove them if they are on the system:
- bind-chroot
- caching-nameserver
# rpm -ev bind-chroot
# rpm -ev caching-nameserver
