Comment 4 for bug 688035

This is a bug in Feeds applet because it should handle this more gracefully, it depends on Gnome keyring in this case.

As to your problem: It seems like you don't have Gnome keyring installed or the daemon isn't started. I still don't know is this Compiz Fusion a standalone desktop environment without Gnome? Gnome usually handles this.

I would say make sure gnome-keyring is installed (pacman -Sy gnome-keyring -- right?) and maybe seahorse, too. The daemon is usually started by gdm, Gnome's login manager. If you're using another login manager you might have to do something about it. If you start seahorse, there should be at least one keyring present. I guess I can't help you more than that, maybe ask in an Arch forum how to make sure gnome-keyring daemon starts at login.