The tag 'XXX' does not exist in XML namespace 'clr-namespace:YYY'

Question

I have implemented a converter to convert Int32 to String to be able to binding a property to a textBox.

I implement this converter in the namespace MyApp.Converters and

Answer 1

For the record ... I've face a similar problem and if I removed the ";assembly=X" part from the XAML it worked fine

But don't really understand the reason.

As suggested in this blog: http://zoomicon.wordpress.com/2012/07/02/fix-the-tag-xxx-does-not-exist-in-xml-namespace-clr-namespaceyyy/#comment-7761