Cannot Access My Admin Or Site

Hi,

I am trying to get to my admin panel and my site to work. When I enter the URL of my site, I see this:

Warning: require_once(/home/content/28/6453528/html/wp-content/plugins/jetpack/class.jetpack.php) [function.require-once]: failed to open stream: No such file or directory in /home/content/28/6453528/html/wp-content/plugins/jetpack/jetpack.php on line 37

Fatal error: require_once() [function.require]: Failed opening required ‘/home/content/28/6453528/html/wp-content/plugins/jetpack/class.jetpack.php’ (include_path=’.:/usr/local/php5/lib/php’) in /home/content/28/6453528/html/wp-content/plugins/jetpack/jetpack.php on line 37

I also see this when I try to type in mysitesurl/wp-admin

please help!