error when trying to admin

I get this message when I click on blog admin. I need help!!! asap! I haven’t been able to do any blogging with this problem.

Server error
The website encountered an error while retrieving http://www.naturallyprevailingessence.com/blog/wp-admin/edit.php?post_type=page. It may be down for maintenance or configured incorrectly.
Here are some suggestions:
Reload this webpage later.
HTTP Error 500 (Internal Server Error