[ubuntu] After adding a repository I see this problem

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http://ubuntuforums.org – I want to upgrade to gnome 3.6 so I add a repository and try it but when I want to use Code: sudo apt-get update I receive this error Code: E: Type 'ain' is not known on line 1 in source list /etc/apt/sources.list.d/gnome3-team-gnome3-precise.list E: The list of sources could not be read. How can I fix this problem ? (Hardware)