[Plugin: wp-comment-master] Fatal error

Fatal error: Cannot redeclare register_mysettings() (previously declared in /home/intervie/public_html/wp-content/plugins/smooth-slider/settings/settings.php:546) in /home/intervie/public_html/wp-content/plugins/wp-comment-master/wp-comment-master.php on line 151

I got that when trying to activate it.

http://wordpress.org/extend/plugins/wp-comment-master/