Gnome-tweak-tool cannot start in gnome-shell 3.6

I got the problem starting gnome-tweak-tool in gnome-shell 3.6 but can start in fallback mode.

After googling and found the solution as below:

sudo cp  /home/USERNAME/.local/share/gnome-shell/extensions/user-theme@gnome-shell-extensions.gcampax.github.com/schemas/org.gnome.shell.extensions.user-theme.gschema.xml  /usr/share/glib-2.0/schemas

sudo glib-compile-schemas /usr/share/glib-2.0/schemas

Where USERNAME is login name.