Error when trying to check for Pre-released updates

When I tick "Pre-released updates" & click "Save" the error below occurs.

Zitat

Failed to execute command 'export LANG=C; apt-get update 2>&1': Ign file: Release.gpg Ign file:/var/cache/openmediavault/archives/ Translation-en Ign file: Release Hit http://ftp.iinet.net.au squeeze Release.gpg Ign http://ftp.iinet.net.au/debian/debian/ squeeze/main Translation-en Hit http://ftp.iinet.net.au squeeze-updates Release.gpg Ign http://ftp.iinet.net.au/debian/debian/ squeeze-updates/main Translation-en Ign http://ftp.iinet.net.au/debian/debian/ squeeze-updates/non-free Translation-en Hit http://ftp.iinet.net.au squeeze Release Hit http://ftp.iinet.net.au squeeze-updates Release Hit http://ftp.iinet.net.au squeeze/main Sources Hit http://ftp.iinet.net.au squeeze/main amd64 Packages Hit http://ftp.iinet.net.au squeeze-updates/main Sources/DiffIndex Hit http://ftp.iinet.net.au squeeze-updates/non-free Sources Hit http://ftp.iinet.net.au squeeze-updates/main amd64 Packages/DiffIndex Hit http://ftp.iinet.net.au squeeze-updates/non-free amd64 Packages Hit http://ftp.iinet.net.au squeeze-updates/main amd64 Packages Hit http://packages.openmediavault.org sardaukar Release.gpg Ign http://packages.openmediavault.org/public/ sardaukar/main Translation-en Ign http://packages.openmediavault.org/public/ sardaukar/partner Translation-en Ign http://packages.openmediavault.org sardaukar-proposed Release.gpg Ign http://packages.openmediavault.org/public/ sardaukar-proposed/main Translation-en Hit http://security.debian.org squeeze/updates Release.gpg Ign http://security.debian.org/ squeeze/updates/main Translation-en Ign http://security.debian.org/ squeeze/updates/non-free Translation-en Hit http://packages.openmediavault.org sardaukar Release Hit http://security.debian.org squeeze/updates Release Ign http://packages.openmediavault.org sardaukar-proposed Release Hit http://security.debian.org squeeze/updates/main Sources Hit http://packages.openmediavault.org sardaukar/main amd64 Packages Hit http://packages.openmediavault.org sardaukar/partner amd64 Packages Hit http://security.debian.org squeeze/updates/non-free Sources Hit http://security.debian.org squeeze/updates/main amd64 Packages Hit http://security.debian.org squeeze/updates/non-free amd64 Packages Err http://packages.openmediavault.org sardaukar-proposed/main amd64 Packages 404 Not Found W: Failed to fetch http://packages.openmediavault…/binary-amd64/Packages.gz 404 Not Found E: Some index files failed to download, they have been ignored, or old ones used instead.

Zitat

Error #4000:
exception 'OMVException' with message 'Failed to execute command 'export LANG=C; apt-get update 2>&1': Ign file: Release.gpg
Ign file:/var/cache/openmediavault/archives/ Translation-en
Ign file: Release
Hit http://ftp.iinet.net.au squeeze Release.gpg
Ign http://ftp.iinet.net.au/debian/debian/ squeeze/main Translation-en
Hit http://ftp.iinet.net.au squeeze-updates Release.gpg
Ign http://ftp.iinet.net.au/debian/debian/ squeeze-updates/main Translation-en
Ign http://ftp.iinet.net.au/debian/debian/ squeeze-updates/non-free Translation-en
Hit http://ftp.iinet.net.au squeeze Release
Hit http://ftp.iinet.net.au squeeze-updates Release
Hit http://ftp.iinet.net.au squeeze/main Sources
Hit http://ftp.iinet.net.au squeeze/main amd64 Packages
Hit http://ftp.iinet.net.au squeeze-updates/main Sources/DiffIndex
Hit http://ftp.iinet.net.au squeeze-updates/non-free Sources
Hit http://ftp.iinet.net.au squeeze-updates/main amd64 Packages/DiffIndex
Hit http://ftp.iinet.net.au squeeze-updates/non-free amd64 Packages
Hit http://ftp.iinet.net.au squeeze-updates/main amd64 Packages
Hit http://packages.openmediavault.org sardaukar Release.gpg
Ign http://packages.openmediavault.org/public/ sardaukar/main Translation-en
Ign http://packages.openmediavault.org/public/ sardaukar/partner Translation-en
Ign http://packages.openmediavault.org sardaukar-proposed Release.gpg
Ign http://packages.openmediavault.org/public/ sardaukar-proposed/main Translation-en
Hit http://security.debian.org squeeze/updates Release.gpg
Ign http://security.debian.org/ squeeze/updates/main Translation-en
Ign http://security.debian.org/ squeeze/updates/non-free Translation-en
Hit http://packages.openmediavault.org sardaukar Release
Hit http://security.debian.org squeeze/updates Release
Ign http://packages.openmediavault.org sardaukar-proposed Release
Hit http://security.debian.org squeeze/updates/main Sources
Hit http://packages.openmediavault.org sardaukar/main amd64 Packages
Hit http://packages.openmediavault.org sardaukar/partner amd64 Packages
Hit http://security.debian.org squeeze/updates/non-free Sources
Hit http://security.debian.org squeeze/updates/main amd64 Packages
Hit http://security.debian.org squeeze/updates/non-free amd64 Packages
Err http://packages.openmediavault.org sardaukar-proposed/main amd64 Packages
404 Not Found
W: Failed to fetch http://packages.openmediavault…/binary-amd64/Packages.gz 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:331
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(62): OMVRpcServiceAbstract->callMethod('update', NULL, Array)
#3 /usr/sbin/omv-engined(495): OMVRpc::exec('Apt', 'update', NULL, Array, 1)
#4 {main}

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I've only set up this NAS a few days ago & it's running version 0.5.35. I installed all the updates in the Update Manager but haven't installed any plugins. Any suggestions?