phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 144 Table './teatral/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 ('a366768e366937dd30ad5e4af3f3712c', -1, 1406265358, 1406265358, '36cdbd9c', 62, 0, 0)

Line : 187
File : sessions.php