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deb http://ftp.debian.org/debian/ testing main contrib non-free
deb http://packages.openmediavault.org/public kralizec main
In fact this installation was made when Wheezy was still the testing release.
I added this but after update i'm getting the same error:
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deb http://http.debian.net/debian wheezy main
deb-src http://http.debian.net/debian wheezy main
deb http://http.debian.net/debian wheezy-updates main
deb-src http://http.debian.net/debian wheezy-updates main
deb http://security.debian.org/ wheezy/updates main
deb-src http://security.debian.org/ wheezy/updates main
thanks