apt-get dist-upgrade failed.



Hi,
I installed debian stable kde with live cd "debian-live-6.0.3-i386-kde-desktop.iso". My PC was not connected with internet, so after the installation, my source.list file was with only one line of cd - repository. Then I populated /source.list/ with following repositories because I want to install debian with testing.

###### Debian Main Repos
deb http://ftp.us.debian.org/debian/ wheezy main contrib non-free
deb-src http://ftp.us.debian.org/debian/ wheezy main contrib non-free

###### Debian Update Repos
deb http://security.debian.org/ wheezy/updates main contrib non-free
deb http://ftp.us.debian.org/debian/ wheezy-proposed-updates main contrib non-free
deb-src http://security.debian.org/ wheezy/updates main contrib non-free
deb-src http://ftp.us.debian.org/debian/ wheezy-proposed-updates main contrib non-free

##############################################################
##################### UNOFFICIAL REPOS ######################
##############################################################

###### 3rd Party Binary Repos

#### Debian Multimedia - http://www.debian-multimedia.org/
## Run this command: apt-get update && apt-get install debian-multimedia-keyring && apt-get update
deb http://www.debian-multimedia.org testing main non-free

#### Google Linux Software Repositories - http://www.google.com
## Run this command: wget -q -O - https://dl-ssl.google.com/linux/linux_signing_key.pub | apt-key add -
deb http://dl.google.com/linux/deb/ stable non-free main

#### Skype - http://www.skype.com
## Run this command: gpg --keyserver pgp.mit.edu --recv-keys 0xd66b746e && gpg --export --armor 0xd66b746e | apt-key add -
deb http://download.skype.com/linux/repos/debian/ stable non-free

To convert debian stable in testing, I fired following commands.
apt-get update
apt-get dist-upgrade
But dist-upgrade failed with following error.
"E: Could not perform immediate configuration on 'phonon-backend-vlc'. Please see man 5 apt.conf under APT::Immediate-Configure for details. (2)"

Please help to fix this issue.

Regards
Amrish