System.Windows.Markup.XamlParseException with WPF application in Visual Studio 2015

I recently had a customer report that sample WPF code from the Chapter 10: Resources chapter of the APRESS book ‘Pro WPF in C#’ was throwing an exception when compiled and run only under the Visual Studio 2015 debugger: System.Windows.Markup.XamlParseException occurred  HResult=-2146233087  LineNumber=8  LinePosition=32  Message=’Provide value on ‘System.Windows.Baml2006.TypeConverterMarkupExtension’ threw an exception.’ Line number ‘8’ and line…