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) VALUES ('5d6266b47ed81f16f1f9e71f172e8b13', -1, 1284151056, 1284151056, '266bbf74', -4, 0)

Line : 158
File : sessions.php