phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1195 Table 'phpbb_sessions' is marked as crashed and last (automatic?) repair failed

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('21cc7ef2d9440d03171e328a8810c5ad', -1, 1284098050, 1284098050, '266bbf57', -9, 0, 0)

Line : 189
File : sessions.php