New database error

Hi. My WP site was working fine, until now, where it now displays this error message on the homepage:

WordPress database error: [Got error 28 from table handler]
SELECT wp_posts.* FROM wp_posts, wp_postmeta WHERE 1=1 AND (post_status = “publish” OR post_author = 1 AND post_status != ‘draft’ AND post_status != ‘static’) GROUP BY wp_posts.ID ORDER BY post_date DESC LIMIT 0, 15

All I’ve done lately is add the wbQuiz plugin (from https://kanslozebagger.org/wbquiz/), which I did yesterday, but it worked afterwards and was fine.

Does anyone know what this error is? Can it be a temporary error on my hosting provider’s end? I’d really appreciate any insight or help.

Thanks,
Amir