Update error?

root@KodiNas:~# omv-update
Ign file:  Release.gpg
Ign file:  Release
Ign file:  Translation-en
Ign http://ftp.de.debian.org wheezy Release.gpg
Ign http://security.debian.org wheezy/updates Release.gpg
Ign http://ftp.de.debian.org wheezy Release
Ign http://security.debian.org wheezy/updates Release
Err http://security.debian.org wheezy/updates/non-free amd64 Packages
  404  Not Found
Ign http://security.debian.org wheezy/updates/main Translation-en
W: Failed to fetch http://security.debian.org/dists/wheezy/updates/non-free/binary-amd64/Packages  404  Not Found


E: Some index files failed to download. They have been ignored, or old ones used instead.

Failed to execute command 'export LANG=C; apt-get update 2>&1': Ign file:  Release.gpg
Ign file:  Release
Ign file:  Translation-en
Ign http://ftp.de.debian.org wheezy Release.gpg
Ign http://ftp.de.debian.org wheezy Release
Err http://ftp.de.debian.org wheezy/main amd64 Packages


Err http://ftp.de.debian.org wheezy/main amd64 Packages


Err http://ftp.de.debian.org wheezy/main amd64 Packages
  404  Not Found
Ign http://packages.omv-extras.org stoneburner-backports Release.gpg
Ign http://packages.omv-extras.org stoneburner Release.gpg
Ign http://packages.omv-extras.org stoneburner-backports Release
Ign http://packages.omv-extras.org stoneburner Release
Ign http://packages.omv-extras.org stoneburner-backports/main Translation-en
W: Failed to fetch http://ftp.de.debian.org/debian/dists/wheezy/main/binary-amd64/Packages  404  Not Found


E: Some index files failed to download. They have been ignored, or old ones used instead.

Fehler #4000:
exception 'OMVException' with message 'Failed to execute command 'export LANG=C; apt-get update 2>&1': Ign file:  Release.gpg
Ign file:  Release
Ign file:  Translation-en
Ign http://ftp.de.debian.org wheezy Release.gpg
Ign http://ftp.de.debian.org wheezy Release
Err http://ftp.de.debian.org wheezy/main amd64 Packages


Err http://ftp.de.debian.org wheezy/main amd64 Packages


Err http://ftp.de.debian.org wheezy/main amd64 Packages
  404  Not Found
Ign http://packages.omv-extras.org stoneburner-backports Release.gpg
Ign http://packages.omv-extras.org stoneburner Release.gpg
Ign http://packages.omv-extras.org stoneburner-backports Release
Ign http://packages.omv-extras.org stoneburner Release
Ign http://packages.omv-extras.org stoneburner-backports/main Translation-en
W: Failed to fetch http://ftp.de.debian.org/debian/dists/wheezy/main/binary-amd64/Packages  404  Not Found


E: Some index files failed to download. They have been ignored, or old ones used instead.' in /usr/share/openmediavault/engined/rpc/apt.inc:276
Stack trace:
#0 [internal function]: OMVRpcServiceApt->update(NULL, Array)
#1 /usr/share/php/openmediavault/rpcservice.inc(125): call_user_func_array(Array, Array)
#2 /usr/share/php/openmediavault/rpc.inc(79): OMVRpcServiceAbstract->callMethod('update', NULL, Array)
#3 /usr/sbin/omv-engined(500): OMVRpc::exec('Apt', 'update', NULL, Array, 1)
#4 {main}