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 ('2a3724699f2f4c740c6fb6ccbfb92987', -1, 1475323683, 1475323683, '36a70004', -1, 0, 0)

Line : 189
File : sessions.php