Database Error

I used a code I found here to make my comments appear in descending order. Everything was find and it worked, but now (the day after), when I go to my wordpress/index.php page i get this:

Database error: [Got error 28 from table handler]
SELECT DISTINCT * FROM wp_posts WHERE 1=1 AND post_date_gmt <= ‘2004-12-30 21:55:59’ AND (post_status = “publish”) GROUP BY wp_posts.ID ORDER BY post_date DESC LIMIT 1

And it says that “No posts matched my criteria”

I took out that code I put in and replaced it with what was originally there but the message is still coming up. Any suggestions on how to fix it?