Resharper debugging unit tests + Rhino Mock

I'm using Resharper+ NUnit + Rhino Mocks and when I trying to debug this piece of code (rightclick->Devug Unit Tests):

[Test]
        public void TestRegistrateUser()
        {
            string result = null;
            IRegView view = repository.StrictMock<IRegView>();
            RegViewPresenter presenter = new RegViewPresenter(view);

            using (repository.Record())
            {
                Expect.Call(view.LastName).Return("");
            }
            using (repository.Playback())
            {
                result = presenter.RegistrateUser();
            }
           
            Assert.AreEqual("LastName is empty", result);
        }

I get the following message:

There is no source code available for the current location.

This happens when I leave the Playback section. Then Rhino Mocks calls verifyAll(). Is there a way to avoid this warning message? When I am using testdriven.net + debugger I don't get this warning.