Hi I am getting the following error (using debug true in wp-config)

I was not able to manage my mapped domains in admin, so I set debug to true in wp-config and got the following error.
Fatal error: Class 'Punycode' not found in /home3/ukvnet/public_html/wp-content/plugins/domain-mapping/classes/Domainmap/Punycode.php on line 42

When I removed the D M plugin things worked, so I could edit the sub domain site.
I then installed a new version of domain mapping and it was back as before not being able to manage my domain mapping. Also I cannot get my Sites page to show my sites in network admin. I have logged out and in again, and disabled most of my plugins with no result.