Problem: "Mapping URI" errors with WPF Assembly Names that include spaces
This is a somewhat insidious bug. As it turns out, if you have spaces in your WPF project's assembly name, you can get "Mapping URI" errors in your project's XAML (even if the solution itself builds properly). As you might imagine, you can get around this bug by changing the namespace. For example:
Change this:
OakLeaf MM WPF
To:
OakLeaf.MM.WPF
Kevin McNeish
Microsoft .NET MVP
INETA Speaker
Chief Architect, MM .NET Application Framework
http://www.oakleafsd.com