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 ('0c5b64d9bc156ff067d357ea11da50e4', -1, 1246582578, 1246582578, '26673f37', 0, 0, 0)

Line : 187
File : sessions.php