gnome-tweak-tool Settings schema not installed error

When you run gnome-tweak-tool after installing Gnome 3 you can get the following error:

GLib-GIO-ERROR **: Settings schema '' is not installed

The cause is that you are missing a schema which is installed together with gnome-shell (which is probably not installed because you are running the fallback mode). The obvious fix is to install gnome-shell. But if you want to run Gnome 3 in fallback mode you need to do some additional steps: Open the System Settings, go to System Info, Graphics and check “Forced Fallback Mode”.

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