I download the YAF-v1.9.5.5-BETA-SRC.
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?

I download the YAF-v1.9.5.5-BETA-SRC.

Please use the Final (RTW) instead

Does the yaf use the autofac.dll?

Yes.

I download the autofac.dll(2.0) and reference it into my project.
But also get the same wrong page?

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