adding service referece for SharePoint in the Class Library

Hi there,

I create a Class Library and a WCF for the SharePoint. currently I add Service reference in the class library to use it for testing. but I got an error when I new an Instance.

I refer to "https://blogs.msdn.microsoft.com/dsnotes/2015/04/09/wcf-consuming-wcf-web-service-in-a-dll/". do u know how to deal with it.? is there any solution on it.?

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