MailChimp update has crashed my entire site

Hi

I just tried to update the Mailchimp plugin on my website SJMedia.co

It crashed my site

Now nothing will come up but this when I type in my website URL. I have no idea what it means and I am absolutely panicking.

I am a tech newb – I don’t understand what any of this jargon means. PLEASE HELP. Thank you.

Warning: require_once(/var/sites/s/sjmedia.co/public_html/wp-content/plugins/mailchimp-for-wp/integrations/bootstrap.php) [function.require-once]: failed to open stream: No such file or directory in /var/sites/s/sjmedia.co/public_html/wp-content/plugins/mailchimp-for-wp/mailchimp-for-wp.php on line 78

Fatal error: require_once() [function.require]: Failed opening required ‘/var/sites/s/sjmedia.co/public_html/wp-content/plugins/mailchimp-for-wp/integrations/bootstrap.php’ (include_path=’.:/usr/local/lib/php’) in /var/sites/s/sjmedia.co/public_html/wp-content/plugins/mailchimp-for-wp/mailchimp-for-wp.php on line 78