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 ('1878960f4db57fdb925cd0c72f2dd7eb', -1, 1498324147, 1498324147, '36a69e49', 20, 0, 0)

Line : 187
File : sessions.php