Expression Blend 4 failing when tries to load Reactive assembly

Maybe someone have same problem

When I try to set data context type of view to desired View Model. The error appears:

Could not load the assembly System.Reactive.Windows.Threading because the following errors occurred: Meth开发者_如何转开发od 'Schedule in type 'System.Reactive.Concurrency.DispatcherScheduler' from assembly *System.Reactive.Windows.Threading, Version=1.0.10621.0, Culture= neutral, RublicKeyToken=31b13856ad364e35' does not have an implementation.

Any thoughts? I have looked at disassembled code, and the method has implementation.

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Try adding a file reference to System.Reactive.Windows.Threading.dll to your project. I've had a similar error and that fixed it.