WP Smush Pro Plugin Caused 500 errors

My web hosting provider reported the following, after the plugin started causing 500 errors on my website and had to be disabled.

Fatal error: Cannot redeclare wp_smush_rating_message() (previously declared in /var/www/dragonblogger.com/wp-content/plugins/wp-smush-pro/wp-smush.php:68) in /var/www/dragonblogge r.com/wp-content/plugins/wp-smushit/wp-smush.php on line 93