I have a WPF project like this:  

![enter image description here](https://i.stack.imgur.com/gIPm9.jpg)

In a xaml file in my RCISP.WPF project I want to reference a class defined in my RCISP.Common Project. When I reference this class I got a xaml error like this:

![enter image description here](https://i.stack.imgur.com/b0sY7.jpg)

> 
> Assembly 'mayclass' was not found.Verify that you are not missing as assembly
> reference.Also,verify that your project and all referenced assemblies
> have been built;
> 
> 
> 

But I have reference to RCISP.Common in my RCISP.WPF...