phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 144 Table './flacycl_bikeforum/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 ('4a4da0ded7cc9cb1a01a70889f53b2f2', -1, 1481183290, 1481183290, '36a38160', 20, 0, 0)

Line : 187
File : sessions.php