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 ('a987bd5177ff0e2b040d98366e01e2f8', -1, 1475285156, 1475285156, '36e30e17', 20, 0, 0)

Line : 187
File : sessions.php