phpBB : Critical Error

Error doing DB query userdata row fetch

DEBUG MODE

SQL Error : 144 Table './runningw_phpbb1/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 = 'bcad8a5dbf89a8e5c1e169ecada2fa25' AND u.user_id = s.session_user_id

Line : 319
File : sessions.php