If you ever get the error "Error from park wrapper: Using nameservers with the following IPs: IPADDRESS, IPADDRESS Sorry, the domain is already pointed to an IP address that does not appear to use DNS servers associated with this server. Please transfer the domain to this servers nameservers or have your administrator add one of its nameservers to /etc/ips.remotedns and make the proper A entries on that remote nameserver."
Please make sure that you have waited at least 72 hours before you try to add an addon domain...