How to run sugar on ArchLinux

[lite li]

Hi, James Cameron,

> 1.  run sugar-emulator, or
> 2.  Log out of your desktop, then on the login screen look for a desktop
> option for Sugar.

Both of them not working.
Run sugar-emulator, after about 5 seconds, it will exit.
And desktop option for Sugar also like this.
Maybe I missing some base activities.

>
> Expected.  sugar-launch is only useful when Sugar is running.

Thanks for your help.