I got this error message:
when trying to create a Background Application (IoT) project in Visual Studio 2015:
When reading through the setup guide http://ms-iot.github.io/content/en-US/win10/SetupPCRPI.htm an extra time I found out that I've missed installing this when installing Visual Studio 2015:
The required version of Visual Studio Tools for Universal Windows Apps is
I click on the Templates | Visual C# | Windows | Universal
and from there I installed the templates and after that the error message when creating a background application disappeared.