Lame Server

[Akaash T]

Dear all
  My dns server is showing as lame server in dnsreport.com.Iam using isc
bind software.can u
please tellme how to solve it. my domain name is soft.net
<http://soft.net>and ip address is
164.164.4.5.The following erro
am getting when am checking in dnsreport site.
 ERROR: You have one or more lame nameservers. These are nameservers that do
NOT answer authoritatively for your domain. This is bad; for example, these
nameservers may never get updated. The following nameservers are lame:
 Regards
akash.t