Can not active WP Smush Pro. Error is in description.

Fatal error: Cannot redeclare i18n() (previously declared in /home/epaperlive/public_html/bangla/wp-content/plugins/wp-smushit/wp-smush.php:278) in /home/epaperlive/public_html/bangla/wp-content/plugins/wp-smush-pro/wp-smush.php on line 276