Tvheadend

I just got Crunchbang Linux installed. I'm following this tutorial:https://www.lonelycoder.com/redmine/projects/tvheadend/wiki/Download?version=2

I added deb http://www.lonelycoder.com/debian/ hts main to my sources

When I run sudo aptitude update I get the following error
"W: GPG error: http://packages.crunchbang.org squeeze-backports Release: The following signatures were invalid: KEYEXPIRED 1352888501"

I Googled this error and found something similar to it. It said to run apt-get -t squeeze-backports pkg-mozilla-archive-keyring

When I run that I get "E: Invalid operation pkg-mozilla-archive-keyring" so now I'm not so sure what to do. I've Googled on multiple pieces of these errors, but can't seem to find anything. This is the thread I was following on this error: http://crunchbang.org/forums/viewtopic.php?pid=276571

I also tried to run wget q -O http://www.lonelycoder.com/public.key | sudo apt-key add -, which returns an ok. Then when I run the update again it says the key is expired still.

Can someone help me with this? I'm a complete noob with Linux and I have no idea how to use the public key. I looked on the Ubuntu site at how to add repositories since Ubuntu is similar to Debian, but they don't tell you how to add keys.

Thanks