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 ('f3a61f59bc5fdcc7ac70a9794e3ac83a', -1, 1472547794, 1472547794, '36e13aee', 21, 0)

Line : 158
File : sessions.php