phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 144 Table './aa_forum/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 ('0b0678fe2f7ee5e20eefce6187506db1', -1, 1283464000, 1283464000, '266bbf54', -2, 0, 0)

Line : 187
File : sessions.php