phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 145 Table '.\mymac\phpbb_sessions' is marked as crashed and should be repaired

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('8dab3ca4ab136776c750a2cca5b9d49b', -1, 1268289206, 1268289206, '266bbf6c', 17, 0, 0)

Line : 187
File : sessions.php