I want to upgrade to gnome 3.6 so I add a repository and try it but when I want to use
sudo apt-get update
I receive this error

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 ?