How to enable shelluser-themeextension

How to enable shelluser-themeextension-Linux general technology-Linux technology and application information. New linux
System fedora 16
# Rpm-qa | grep gnome-shell
Gnome-shell-extension-user-theme-3.2.3-1.fc16.noarch
Gnome-shell-theme-dark-glass-1.0-1.fc16.noarch
Gnome-shell-extension-systemMonitor-3.2.3-1.fc16.noarch
Gnome-shell-extension-alternative-status-menu-3.2.3-1.fc16.noarch
Gnome-shell-3.2.1-2.fc16.i686
Gnome-shell-extension-theme-selector-0.9-3.fc16.noarch
Gnome-shell-extension-drive-menu-3.2.3-1.fc16.noarch
Gnome-shell-extension-places-menu-3.2.3-1.fc16.noarch
Gnome-shell-extension-common-3.2.3-1.fc16.noarch

Install gnome-tweak-tool
After it is turned on, you cannot select the theme to be installed. The drop-down box is dimmed and the orange exclamation mark on the left is displayed. If you hover your mouse over it, the following prompt is displayed: shell user-theme-extension not enable.
However, ON is clearly selected ON the extension tab. Other extension functions are effective when enabled and disabled.
For details, see the attachment image.
Alt-F2 r tried to restart and also tried.

Baidu and google have done their best.

A headache. Please kindly advise me. Thank you!