GP Action Task in UWL Error - Page not found or not available

Hi, SDN Fellow.

I have configured the Guide Procedure connector in UWL Administration to display GP task item in UWL.

I created a new process - says XYZ Form Approval Process. I tested the XYZ process in the GP Runtime, every activity screens come out fine. I am able to see all the Guide Procedure task items in the Task console.

But when I launching the activity item from UWL Task console, by clicking on the item line. It was trying to navigate to the page, but it thrown an error message like the following: "Page not found or not available".

Can anyone advise me where should I go to look at the problem?

Thanks,

KC