LinuxMint update fault - 404 not found

deb http://packages.linuxmint.com/ debian main upstream import
deb http://debian.linuxmint.com/latest testing main contrib non-free
deb http://security.debian.org/ testing/updates main contrib non-free
-->deb http://debian.linuxmint.com/latest/security testing/updates main contrib non-free
deb http://www.debian-multimedia.org testing main non-free
-->deb http://debian.linuxmint.com/latest/multimedia testing main non-free