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 ('a979ac7d9e783f20737c56df5cbfb7be', -1, 1511362071, 1511362071, '36c6dd0d', 21, 0, 0)

Line : 211
File : sessions.php