phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 144 Table './forum_members/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) VALUES ('d917759010d483be9ef2e958ae63ac20', -1, 1474781117, 1474781117, '36a741f7', 21, 0)

Line : 158
File : sessions.php