phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1114 The table 'phpbb_sessions' is full

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('29b9f64cb8d6df2f5120cd9cc47d245b', -1, 1474965532, 1474965532, '36e2eeb2', -1, 0, 0)

Line : 187
File : sessions.php