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 ('12076e61218c67f1cbf9524e0435a70f', -1, 1475180391, 1475180391, '36f2e0fa', -4, 0, 0)

Line : 172
File : sessions.php