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 ('f7e7fa588bf435bc7db17f55ca47e873', -1, 1414692775, 1414692775, '1716ad3a', 31, 0)

Line : 158
File : sessions.php