phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 144 Table './phpbb/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, session_admin) VALUES ('9196e4da1dd1d94d7c6c772b29fb1d05', -1, 1475317092, 1475317092, '36e26e8f', 1, 0, 0)

Line : 189
File : sessions.php