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 ('55e07c6d10d2f73a77eccc697ceaa05f', -1, 1406696283, 1406696283, '36e343d2', 33, 0, 0)

Line : 187
File : sessions.php