cant start nancy self host without admin rights-open source projects NancyFx/Nancy

My app uses Nancy Selfhosting. When I launch it without admin rights I get a System.Net.HttpListenerException “Access Denied”.

Here is the code:

static void Main(string[] args)
    {   
        var nancyHost = new Nancy.Hosting.Self.NancyHost(new Uri("http://localhost:80/"));
        nancyHost.Start();
        Application.Run();
    }

I have also tried different ports without success. Strangely, I dont get any Exceptions when launching a HttpListener that listens to the same Url. What could be causing this exception?