http://developers.de/blogs/damir_dobric/archive/2016/06/24/build-error-error-appx1706.aspxIn a time of transition form .NET framework to .NET core, you might run into issues, which you never ha before. This is the price for open source. For example, look at following error: error APPX1706: The .winmd file 'Windows.Foundation.UniversalApiContractenCommunityServer 2008 SP1 (Build: 30619.63)