What is THIS message?

Sorry, but question got lost in another thread. iSimplify. Go here:

http://www.macliberals.com/heapblog/

Do you know what that message in green means? Or where I could start looking for clues? Or if there is a file to swap out?

Here’s the message:

WordPress database error: [Unknown column ‘time_modified’ in ‘order clause’]
SELECT * FROM wp_posts WHERE post_status = ‘static’ ORDER BY time_modified ASC

Anyone? I’d be most obliged.