It seems like BIND was not installed on your server hence you got the error. Did you specify which applications to install when installing Webuzo on your server as below:
./install.sh --install=lemp,bind // This will install the LEMP Stack(softname -> lemp) and DNS Server
(softname -> bind) along with Webuzo.
Note : softname for Apps should be comma separated.
Get list of softnames for the Apps here : http://api.webuzo.com/apps.php