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 ('950064d8068930b4136c71a24eb3344f', -1, 1406265364, 1406265364, '36c68cb6', -1, 0, 0)

Line : 187
File : sessions.php