Running/building Launchpad Utilities fails.

I can build and run the actual Launchpad application just fine, but trying to run the Utilities, I get the error:
```(Launchpad.Utilities:10156): GLib-GIO-ERROR **: 14:41:05.235: Settings schema 'org.gtk.Settings.FileChooser' does not contain a key named 'show-type-column'```
and it crashes.