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 ('6ffb242f21f4e8df91ec0b8581ffa9ee', -1, 1475192778, 1475192778, '36a70004', -1, 0, 0)

Line : 187
File : sessions.php