I know there have been other references to this issue. But I didn\'t upgrade from one version of VS to another. I am currently using VS 2013. The project builds fine, and ha
Having just re-installed VS 2017 (15.5.6) I ran into this with one of three WCF projects. I picked through the csprojs for all three and could find no difference between them, cutting and pasting the various imports, paths etc from the working ones didn't make any difference.
Adding the nuget package MSBuild.Microsoft.VisualStudio.Web.targets (v14.0.0.3 was the latest, i.e. VS2015) has fixed the problem...for the moment. I can't believe this has gone away for good though.