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 ('a6e6e6fb91c8f5affed1fbb37ce9c0f4', -1, 1435985962, 1435985962, '36a2a728', -1, 0)

Line : 158
File : sessions.php