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 ('ffb22af8145203ad5ba5cd69d926c8d9', -1, 1488021519, 1488021519, '36a3a443', 20, 0, 0)

Line : 187
File : sessions.php