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 ('13b87c6e2c1903644c7eaefb47e4f3be', -1, 1425192584, 1425192584, '365cf5b9', -1, 0)

Line : 158
File : sessions.php