MySQL error in file: /engine/modules/show.full.php at line 48

Error Number: 144

The Error returned was:
Table './niobium_nitprn/dle_post' is marked as crashed and last (automatic?) repair failed

SQL query:

SELECT * FROM dle_post LEFT JOIN dle_post_extras ON (dle_post.id=dle_post_extras.news_id) WHERE id = '556891'