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 ('a8dee7cb18358865450d6a1f4adc970d', -1, 1284009665, 1284009665, '266bbf76', -10, 0)

Line : 158
File : sessions.php