phpBB : Critical Error

Error doing DB query userdata row fetch

DEBUG MODE

SQL Error : 144 Table './ekkso/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 = '3a8f9bf49e0bd6c154a35a1a8c1fd40a' AND u.user_id = s.session_user_id

Line : 315
File : sessions.php