How to pass prameter in URL iView

Dear all:

I need to send logon user id to the web page which is put in URL iView. That means my URL iView needs to add user id as prameter. I need the URL to open web page looks like 'http://www.mypage.com/csr/main.aspx?UID=XXX', so the web page can read UID.

When I put fix value(without using System) in URL iView this works fine. However, I need to send id according to logon id. I build http system, but after i finish all setup I got an exception " Can't read the prameter 'siteString' from the PCD..

"

Anyone can help me figure out this problem or show me any other way to achieve this?

Thanks