parsing - Dotnetnuke 3.0.12 installing site "Could not load type 'dotnetnuke.common.global'" -

I got a dotnetnuke 3.0.12 installation in a zip file and created a web site under c: \ inetpub \ wwwroot And copied files.

When I use default.aspx, I get an error:

The type 'DotNetNuke.Common.Global' could not be loaded.

You may lose an assembly, if the installation is the source file, then project up in Visual Studio Try loading and step-in code.