Tweet This killed my site

I can’t view the site or the admin panel. I haven’t been able to disable or delete the plugin, so I’m basically dead in the water ….

Fatal error: Internal Zend error – Missing class information for in /home/content/p3pnexwpnas10_data02/41/3607841/html/wp-content/plugins/tweetthis/includes/share-handler.php on line 9