Side-loaded Face-Unlock not working I downloaded and installed facelock.apk on my Motorola Android tablet (running 4.0.3) but it fails with "Face unlock couldn't start.".

What's the reason? What can I do to get it working?
See Goo.im. They have a collection of Google Apps as installable .zip files.

There is an explanation for which packages belongs to what Android version on top.

However there's currently only one separate package for Facelock.