I am getting the error:

Error: access denied. Attempting to post form data from an unauthorized host!

When I try to add an item to the cart while using SSL.

I have seen past posts about this error that says you can get rid of it by modifying the check_referer.func file but I can't find it so I am not sure it still exists in the newest versions of Squirrelcart. If it does, where can I find it? If not, how do I get rid of this message?

Thanks!