And I see this "using Autofac" is on the red line, so it must be reference some dll.

Does the yaf use the autofac.dll?

I download the autofac.dll(2.0) and reference it into my project.

But also get the same wrong page?

Who can tell me what's the problam?

Please use the Final (RTW) instead

Yes.

You dont need to download it separetly its included in the source package.