Domain requires glue record

Hi. I have a server at vps.net with cpanel installed. I had to configure WHM/Cpanel myself. The instructions provided by VPS.net said to leave the DNS as default, which is ns1.vm. I am now trying to point a domain to my server but needed to configure the nameservers. On WHM, Under edit DNS Zone I have the following: domain: mydomain.com mydomain.com 86400 IN NS ns1.mydomain.com mydomain.com 86400 IN NS ns2.mydomain.com mydomain.com 86400 IN A [IP Provided by VPS.net] mydomain.com 86400 IN MX 0 mydomain.com and some more lines for mail, ftp etc then at the bottom ns1 14400 IN A [IP Provided by VPS.net] ns2 14400 IN A [IP Provided by VPS.net] On my Domain registrar, I have pointed all records to the VPS.net IP, and have set the name servers to ns1.mydomain.com and ns2.mydomain.com. But the registrar keeps coming back with error a glue record is required. Am I missing something, what have I done wrong? Also when I go to Nameserver record reports it still says ns1.vm, what is .vm. I thought Virtual Machine, but why hasn't it updated? Thanks for any help