Fatal error on attempt to activate

Hi,

Love the idea. When I go to activate the plugin I get this message:

Fatal error: Cannot redeclare akst_init() (previously declared in /home/.crusoe/innovation2/whatwevelearned.org/wp-content/plugins/gregarious/modules/share-this/share-this.php:158) in /home/.crusoe/innovation2/whatwevelearned.org/wp-content/plugins/share-this/share-this.php on line 400

Not being terribly technical, any suggestions would be most welcome. Thanks for the effort with this . . . I’m looking forward to seeing it in action.