WordPress 2.6.4
Install -->> Activate -->> Settings -->> Advertise
Error message:
Warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, 'Advman_Admin::settings' was given in /home/farmbox/public_html/wp-includes/plugin.php on line 339
Not even sure where to start troubleshooting this problem. Any help is much appreciated.