there I have my website www.citywide.tv set up on mu

Hi there I have my website http://www.citywide.tv set up on mu and I'm getting this error message when I click on the "all pages" button in my main sites http://www.citywide.tv dashboard:

Server error

500
ReloadHide details
The website encountered an error while retrieving http://citywide.tv/wp-admin/edit.php?post_type=page. It may be down for maintenance or configured incorrectly.

Thank you for any advice, -Brian