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 ('558260ad068c00fd7d2d0fa4a29456eb', -1, 1422598822, 1422598822, '36d34c64', 14, 0, 0)

Line : 187
File : sessions.php