[Koha] koha 3.6.x is not installing on debian

I am using debian 6.0.5 i want to install koha 3.6.x in it after adding the line deb http://apt.cpbibliography.com/koha 3.6.x in the file /etc/apt/sources.list.d/koha.list and add key wget -O- http://apt.cpbibliography.com/koha/gpg.asc  | apt-key add - it works fine and key is added but when i run the command apt-get it gives error E: Malformed line 1 in source list /etc/apt/sources.list.d/koha.list (dist parse) E: The list of sources could not be read. any suggestion?