All of those errors are DNS related.
Depnding on who you ask...
You authoritative DNS servers are:
tetard.be nameserver = ns12.wixdns.net
tetard.be nameserver = ns13.wixdns.net
OR
tetard.be nameserver = ns1.cheesehosting.net
tetard.be nameserver = ns2.cheesehosting.net
tetard.be nameserver = ns3.cheesehosting.net
OR
tetard.be nameserver = ns12.wixdns.net
tetard.be nameserver = ns13.wixdns.net
tetard.be nameserver = ns1.cheesehosting.net