I just installed this & then my site crashed with this error...Please HELP!: Fatal error: Cannot

I just installed this plugin & it crashed my entire site with this message....help! Fatal error: Cannot redeclare Dropbox_autoload() (previously declared in /home/content/71/9765571/html/wp-content/plugins/wordpress-backup-to-dropbox/Dropbox_API/src/Dropbox/autoload.php:18) in /home/content/71/9765571/html/wp-content/plugins/snapshot/lib/destinations/dropbox/includes/Dropbox/autoload.php on line 26