The type , provided as the Service attribute value in the ServiceHost directive could not be found.

A reminder to self:

When deplyoing a WCF service, and the assembly is registered in the GAC, don’t forget that in the .svc file one needs to put the full assembly path   in the Service element:

<%@ServiceHostLanguage="C#"Debug="true"Service="TYPENAME, ASSEMBLY NAME, Version=, Culture=neutral, PublicKeyToken=12345678901234"CodeBehind="HelloWorld.svc.cs" %>
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