Main page content is not loading – error message

I’ve had a blog running for 8 weeks and it’s been fine until the last week or so. This morning we are unable to view posts on the main page. The following error message shows up on the top of the page:

WordPress database error: [Got error 28 from table handler]
SELECT DISTINCT * FROM wp_posts WHERE 1=1 AND post_date_gmt <= ‘2005-07-01 10:21:59’ AND (post_status = “publish”) GROUP BY wp_posts.ID ORDER BY post_date DESC LIMIT 0, 13

Then “Sorry, no posts matched your criteria.” appears in the content area. With a Next>> hyperlink. Each time we click on the hyperlink, the error message at the top of the screen changes so that the numbers at the end change.

WordPress database error: [Got error -1 from table handler]
SELECT DISTINCT * FROM wp_posts WHERE 1=1 AND post_date_gmt <= ‘2005-07-01 10:33:59’ AND (post_status = “publish”) GROUP BY wp_posts.ID ORDER BY post_date DESC LIMIT 13, 13

Interestingly if we click on catergories, we get posts. If we click on archives we get posts. We also get the pages from the main categories. We just don’t get them on the main page.

Help?

The blog is twotalentliving.com