phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 144 Table './phpbb/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 ('489a37ffd3e665735f27ea3c840919b9', -1, 1435714128, 1435714128, '36a16eba', 1, 0, 0)

Line : 189
File : sessions.php