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 ('b4a55e73d67c6f0c4ce42eb8e1374faf', -1, 1422468570, 1422468570, '36a3b36c', -1, 0, 0)

Line : 187
File : sessions.php