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 ('3732bae5e1cf097ce137f7fab81a530a', -1, 1425386314, 1425386314, '365780e4', -1, 0)

Line : 158
File : sessions.php