I could not install the PostGis in Stack Builder

Hello,
I opened the Stack Builder 3.0.0 but I could not install the PostGis on the first step when I click the next button I got an error message. The attached image indicates about the problem you can see below. Does somebody know how to resolve this? Please help me regarding this issue.
Thank You

Problem: Failed to open the application list:
https://www.postgresql.org/message-id/1321102833514-4986863.post%40n5.nabble.com
Error: The URL specified could not be opened.
