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 ('78ef3fb614261530eb50f2f43c00a7d0', -1, 1475323447, 1475323447, '36f20961', 20, 0, 0)

Line : 187
File : sessions.php