An exception ... Interface not supported.

At the end of the test I have an error message every time.

"An exception occurred within the TtcUtilsManager handler of the TtcTestEngineEventDispatcher event:  Interface not supported."

I am trying to execute an example from the TestComplete Help, the example is about using timers:

the link to example is http://support.smartbear.com/viewarticle/69564/#ID0EVFAC

// Unit1

function Main()
{
  // Create a 30-second timeout timer
  Utils.Timers.Add(30000, "Unit1.TimeoutTimer", true);

  // This loop will be stopped after about the 30th iteration
  for (var i = 1; i <= 100; i++)
  {
    Log.Message(i);
    Delay(1000);
  }
}
 
function TimeoutTimer()
{
  Log.Message("The test timeout has been reached... Stopping the test.");
  //Runner.Stop();
}

 Please hint how can I fix this problem. I use TestComplete 10.3