WordPress database error: [Got error 28 from storage engine]

Hi
I used wordpress on my blog at donaldlim.com
On the page, it has the following error:

WordPress database error: [Got error 28 from storage engine]
SELECT SQL_CALC_FOUND_ROWS wp_posts.* FROM wp_posts LEFT JOIN wp_post2cat ON (wp_posts.ID = wp_post2cat.post_id) LEFT JOIN wp_categories ON (wp_post2cat.category_id = wp_categories.cat_ID) WHERE 1=1 AND category_id IN (0) AND (post_type = ‘post’ AND (post_status = ‘publish’ OR post_status = ‘private’)) GROUP BY wp_posts.ID ORDER BY post_date DESC LIMIT 0, 1

I think I got this error when I was trying to reorganise my categories.

Anyone advise please?

Thanks a lot!