phpBB by Przemo : Critical Error

Error doing DB query userdata row fetch

DEBUG MODE

SQL Error : 23 Out of resources when opening file './corel/phpbb_users.MYD' (Errcode: 24)

SELECT u.*, s.* FROM (phpbb_sessions s, phpbb_users u) WHERE s.session_id = 'f42e784c3ddfcfe8b67084f82a33badb' AND u.user_id = s.session_user_id

Line : 616
File : sessions.php