DotMemoryUnitException : Profiler is not active

I have installed dotMemory Unit, and get the following error when I try to run a memory unit test:

    DotMemoryUnitException : Profiler is not active

    Stack trace:

    at JetBrains.dotMemoryUnit.ClientController.DotMemoryUnitClient.AssertIsActive()

    at JetBrains.dotMemoryUnit.Client.DotMemoryUnitProxy.get_Instance()
    at JetBrains.dotMemoryUnit.Controller.TestController.TestEnd()
    at NUnitTestProject1.Tests.TestMemory() in D:\meps\mfn-lib-core-cs\Solutions\NUnitTestProject1\UnitTest1.cs:line 21

My unit test is as follows:

    [Test]
    public void TestMemory()
    {
        dotMemory.Check();
    }