Weird Database Error…

I have this weird database error that appears on the blogs home page. Don’t know how to get it off, since my site is not affected, its just a very ugly eye sore.

This is what it says:

‘

WordPress database error: [You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ‘GROUP BY year(post_date), month(post_date), dayofmonth(post_date)’ at line 1]
SELECT DISTINCT post_date FROM GROUP BY year(post_date), month(post_date), dayofmonth(post_date)’

^ Is the link to the blog so you can see what i mean