Bug: SitefinityWebApp.csproj contains multiple "Import Project" lines.
When building a project in Visual Studio 2015 I get the following warning message :
Warning "C:\Program Files (x86)\MSBuild\14.0\Microsoft.Common.props" cannot be imported again. It was already imported at "E:\!Sitefinity\Projects\SubZero\SitefinityWebApp.csproj (3,3)". This is most likely a build authoring error. This subsequent import will be ignored.<Import Project = "$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition = "Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />"Is this a known bug?
I've not determined the exact cause yet, but it happens even if the file has never been opened in Visual Studio.
The solution:
Thanks David, good catch.