Help with Multisite Network: Pro Sites (New user problems)

This Plugins are installed on Multisite Network:
Pro Sites
Domain Mapping
Set password

Hi, I installed pro site. I updated my settings & levels in pro site. Then I go to register with a new user, add in new user info. It then goes to my email, I receive the email saying (To activate your blog, please click the following link:

After you activate, you will receive *another email* with your login.

After you activate, you can visit your site here:

When I click on the link it gives me a error message (This webpage is not available).
I really need some help with this issue please. Thank you!