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 ('d8ee5701b35b5d6f1dce6d92fe6a088b', -1, 1475217365, 1475217365, '7f000001', 8, 0, 0)

Line : 187
File : sessions.php