Error while running a test: System.MissingMethodException

I'm using VS2010. Silverlight 4, NUnit 2.5.5, and TypeMock
TypemockIsolatorSetup6.0.3.619.msi

In the test project MVVM is implemented, PeopleViewModel is a ViewModel which I want to test.

This is the code of the test:

        [Test]
        [SilverlightUnitTest]  
        public void SomeTestAgainstSilverlight()
        {
            PeopleViewModel o = new PeopleViewModel();
            var res = o.People;
            
            Assert.AreEqual(15, res.Count());
        }

While running the test in ReSharper i get the following error:

TestA.SomeTestAgainstSilverlight : Failed******************************************
*Loading Silverlight Isolation Aspects...*
******************************************

 TEST RESULTS: 
---------------------------------------------

System.MissingMethodException : Method not found: 'hv TypeMock.ArrangeActAssert.Isolate.a(System.Delegate)'.
at a4.a(ref Delegate A_0)
at a4.a(Boolean A_0)
at il.b()
at CThru.Silverlight.SilverlightUnitTestAttribute.Init()
at CThru.Silverlight.SilverlightUnitTestAttribute.Execute()
at TypeMock.MockManager.a(String A_0, String A_1, Object A_2, Object A_3, Boolean A_4, Object[] A_5)
at TypeMock.InternalMockManager.getReturn(Object that, String typeName, String methodName, Object methodParameters, Boolean isInjected)
at Tests.TestA.SomeTestAgainstSilverlight() in TestA.cs: line 21 

While running test in NUnit i get:

Tests.TestA.SomeTestAgainstSilverlight:
System.DllNotFoundException : Unable to load DLL 'agcore': The specified module could not be found. (Exception from HRESULT: 0x8007007E)

at MS.Internal.XcpImports.Application_GetCurrentNative(IntPtr context, IntPtr& obj)
at MS.Internal.XcpImports.Application_GetCurrent(IntPtr& pApp)
at System.Windows.Application.get_Current()
at ViewModelExample.ViewModel.ViewModelBase.get_IsDesignTime() in C:Documents and SettingsUSERDesktopViewModelExampleViewModelExampleViewModelViewModelBase.cs:line 20
at ViewModelExample.ViewModel.PeopleViewModel..ctor(IServiceAgent serviceAgent) in C:Documents and SettingsUSERDesktopViewModelExampleViewModelExampleViewModelPeopleViewModel.cs:line 28
at ViewModelExample.ViewModel.PeopleViewModel..ctor() in C:Documents and SettingsUSERDesktopViewModelExampleViewModelExampleViewModelPeopleViewModel.cs:line 24
at Tests.TestA.SomeTestAgainstSilverlight() in C:Documents and SettingsUSERDesktopViewModelExampleTestsTestA.cs:line 22

I'm investigating how we can conduct unit testing of Silverlight UI. And I hope TypeMock (CThru.Silverlight) will mange it.

TIA