Test method is inconclusive: Test wasn't run. Error?

I have a test class and below I have posted a sample test from the test class

namespace AdminPortal.Tests.Controller_Test.Customer
{
    [TestClass]
    public class BusinessUnitControllerTests
    {
        private IBusinessUnitRepository _mockBusinessUnitRepository;
        private BusinessUnitController _controller;

        [TestInitialize]
        public void TestInitialize()
        {
            _mockBusinessUnitRepository = MockRepository.GenerateMock<IBusinessUnitRepository>();
            _controller = new BusinessUnitController(_mockBusinessUnitRepository);
        }

        [TestCleanup]
        public void TestCleanup()
        {
            _mockBusinessUnitRepository = null;

            _controller.Dispose();
            _controller = null;

        }

        #region Index Action Tests
        [TestMethod]
        public void Index_Action_Calls_GetAllBusinessUnit()
        {
            _mockBusinessUnitRepository.Stub(x => x.GetAllBusinessUnit());

            _controller.Index();

            _mockBusinessUnitRepository.AssertWasCalled(x=>x.GetAllBusinessUnit());
        }
    }
}

When I run the project I get following screen

I checked the references and the test project has the reference to main project. Any idea why the test are not running or saying that they were inconclusive?

Edit 1:

I saw a post here and changed my test's setting's default processor architecture to X64 but it still doesn't work.

Solution 1:

Just in case none of the above options worked for anyone I fixed my instance of this error by noticing a corrupt entry in my App.Config due to a missing nuget package in the test project.

Solution 2:

For me it was rather frustrating, but I've found solution for my case at least:

If your TestMethod is async, it cannot be void. It MUST return Task.

Hope it helps someone :)

Solution 3:

I had the same issue with resharper and I corrected this error by changing an option:

Resharper => Options => Tools => Unit Testing

I just had to uncheck the option "Shadow-copy assemblies being tested"

Solution 4:

It was a Resharper issue. In Resharper options->Tools->MSTEST, I unchecked the Use Legacy Runner and now it works.

Solution 5:

For me, simply cleaning and rebuilding the solution fixed it.