phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 145 Table './phpbb/phpbb_sessions' is marked as crashed and should be repaired

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('0add600c0a861a4cf4fa9e4a48c96691', -1, 1406020673, 1406020673, '3657864a', -1, 0, 0)

Line : 187
File : sessions.php