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 ('9621aa9ad8406db88bf0b8b572f72a05', -1, 1408587715, 1408587715, '3653e3bf', -1, 0, 0)

Line : 187
File : sessions.php