After installing Microsoft Visual Studio 2015 Update 1, or installing or repairing the
Windows 10 SDK and tools, July 2015 release, you are encountering the following:
$exception {"Method not found: 'Void Windows.Foundation.Metadata.ComposableAttribute..ctor(System.Type, Windows.Foundation.Metadata.CompositionType, UInt32, System.String)'."}
System.MissingMethodException” or some other failure in .NET.
This issue is exposed when installing the older Windows 10 SDK and tools, July 2015 release after installing the more recent
Windows SDK and tools for Windows 10, version 1511.
This problem can be confirmed to be the issue if the following file: C:\Program Files (x86)\Windows Kits\10\References\Windows.Foundation.FoundationContract\1.0.0.0\Windows.Foundation.FoundationContract.winmd is dated before 11/19/2015.