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 ('8552584c0866d23fe1be5bcbaccdf2f9', -1, 1284009700, 1284009700, '266bbf77', -4, 0)

Line : 158
File : sessions.php