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 ('9e00f44c3cd172ff7b9233daaf2f3f92', -1, 1474750187, 1474750187, '36f20961', 20, 0, 0)

Line : 187
File : sessions.php