Few most seen errors with bind/DNS and instruction on how to fix them
Error in named configuration:
/etc/named.conf:57: zone 'ns1.web.co.uk': already exists previous definition: /etc/named.conf:46
/etc/named.conf:58: zone 'ns2.web.co.uk': already exists previous definition: /etc/named.conf:47
Edit file /etc/named.conf with your favorite file editor or from CWP and remove duplicated entries for above specified zones.