With no blend file it is kind of hard to tell. But, you might want to try to delete all your rig stuff, reload rigify and try it again. Do not delete any of the bones when you are placing them in your character, don’t move them off the support rig(IE don’t disconnect connected ones. It looks like it is not finding the names of the org bones it is looking for. Don’t rename any of the bones. Use them all and you shouldn’t have this problem.
You can also try clicking File > User Preferences, and making sure Auto Run Python Scripts is checked. I think that’s in the File tab or the System tab, but you might have to look around for it.