Fresh 1.5.1 installation on local server - no other add ons.

Server OS: Linux 3.11.0-20-generic
PHP Version: 5.5.3-1ubuntu2.3 (Zend: 2.5.0)
HTTP Server: Apache/2.4.6 (Ubuntu)

When selecting Admin> Configuration > Westminster New Template Configuration this error keeps appearing in the logs:

[31-May-2014 07:33:36 Australia/Brisbane] PHP Warning: call_user_func() expects parameter 1 to be a valid callback, function 'zen_cfg_select_option(array('true', 'false'),' not found or invalid function name in /var/www/username/admin-name/includes/functions/general.php on line 1706
[31-May-2014 07:33:36 Australia/Brisbane] PHP Warning: call_user_func() expects parameter 1 to be a valid callback, function 'zen_cfg_select_option(array('true', 'false'),' not found or invalid function name in /var/www/username/admin-name/includes/functions/general.php on line 1706
It occurs simply by selecting 'Westminster New Template Configuration' - no other 'clicks' .....