phpBB : Critical Error

Error doing DB query userdata row fetch

DEBUG MODE

SQL Error : 144 Table './dbmedicportal/forum_sessions' is marked as crashed and last (automatic?) repair failed

SELECT u.*, s.* FROM forum_sessions s, forum_users u WHERE s.session_id = 'ae86102722091728edcf5837e804f419' AND u.user_id = s.session_user_id

Line : 315
File : sessions.php