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 ('7fdeddfd11e8ef3e9f18015b57791e5a', -1, 1258849650, 1258849650, '266bbf55', 171836, 0, 0)

Line : 199
File : sessions.php