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 ('6c10d4a52e91a6b61c4d9bac26b8d75a', -1, 1427502609, 1427502609, '36a36926', 2, 0, 0)

Line : 189
File : sessions.php