phpBB : Critical Error

Error doing DB query userdata row fetch

DEBUG MODE

SQL Error : 144 Table './judgement4/phpbb_sessions' is marked as crashed and last (automatic?) repair failed

SELECT u.*, s.* FROM phpbb_sessions s, phpbb_users u WHERE s.session_id = '31a7b7c2be36b706ded5de0c5c9d5f71' AND u.user_id = s.session_user_id

Line : 315
File : sessions.php