DEBUG MODE

[Escipion el Africano]

I have problems with my forum.

when anyone try to post or read a message this sign appears:

Could not obtain post/user information.

DEBUG MODE

SQL Error : 1016 Can't open file: 'qarthadash_posts_text.MYI' (errno: 145)

SELECT u.username, u.user_id, u.user_posts, u.user_from, u.user_website, u.user_email, u.user_icq, u.user_aim, u.user_yim, u.user_regdate, u.user_msnm, u.user_viewemail, u.user_rank, u.user_sig, u.user_sig_bbcode_uid, u.user_avatar, u.user_avatar_type, u.user_allowavatar, u.user_allowsmile, p.*, pt.post_text, pt.post_subject, pt.bbcode_uid FROM qarthadash_posts p, qarthadash_users u, qarthadash_posts_text pt WHERE p.topic_id = 1708 AND pt.post_id = p.post_id AND u.user_id = p.poster_id ORDER BY p.post_time ASC LIMIT 0, 15

Line : 399
File : viewtopic.php

what can I do to resolve this?