Hi Bunheng,
I have a forum thread for issues with this module, could you post your issue to that (so that others can see too)?
The URL is: http://www.silverstripe.org/all-other-modules/show/279615
Also, could you attach your Current Silverstripe version number, any modules you use and php,mysql?
Unfortunately it has been a little while since I have been able to do any proper development work on my modules, as work has taken me elsewhere. I need to do some updates when I get a chance :s.
Mo