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 ('596b8d15884af5112f86b36dbd6d6cf8', -1, 1475272706, 1475272706, '365bc988', -1, 0)

Line : 158
File : sessions.php