Smush took down my website!

Hi, I just added the pro version of Smush to a new website, where I previously had the free version. I downloaded the pro version, then uploaded it. I got an error message:
Fatal error: Cannot redeclare i18n() (previously declared in /home/deppecom/public_html/mhfanassau.com/wp-content/plugins/wp-smush-pro/wp-smush.php:275) in /home/deppecom/public_html/mhfanassau.com/wp-content/plugins/wp-smushit/wp-smush.php on line 280

I cannot get into the site at all now! The address for the site is mhfanassau.com

can you help? Thanks, Kim