这个WCF错误是什么意思:“自定义工具警告:不能导入wsdl:portType”

I created a WCF service library project in my solution, and have service references to this. I use the services from a class library, so I have references from my WPF application project in addition to the class library. Services are set up straight forward - only changed to get async service functions. I created a WCF service library project in my s