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 ('e3c6ac6b5c2335509e4c2b91d0a89d61', -1, 1425192588, 1425192588, '3690d999', -1, 0, 0)

Line : 187
File : sessions.php