NUnit 2.60 attributes are not recognized by Isolator 7.1

Hi, I use NUnit 2.60 and Typemock 7.1.
I have a class to setup some resources before running nunit tests like the following, but when i use Typemock to run the tests, it does not call the AssemblySetup, and my tests are failed.

 [SetUpFixture]
    public sealed class AssemblySetup
    {
        private IDisposable _tearDown;

        [SetUp]
        public void SetUp()
        {
            _tearDown = TestAssemblySetupUtilities.CommonSetUp();
        }

        [TearDown]
        public void TearDown()
        {
            _tearDown.DisposeIfNonNull();
            _tearDown = null;
        }
    }

Will anyone share some thoughts on this? Thank you.
Xi