The 'clr-namespace' URI refers to a namespace that is not included in the assembly

Question

I\'m trying to include in my XAML some classes which convert values. However, I\'m getting the following error when I compile:

Undefined CLR namespac

Answer 1

some problem with vs2008 designer

do this:

1. close the designer
2. rebuild-all (Alt+B+R) the solution

now there wont be any errors.