What does this WCF error mean: “Custom tool warning: Cannot import wsdl:portType”

I found my answer here: http://www.lukepuplett.com/2010/07/note-to-self-don-let-wcf-svcutil-reuse.html

Long story short: I unchecked Reuse types in reference assemblies from the Advanced menu.

I don’t know if this matters but i’m not using MVC, but Web Forms.