from tutorial
System.NullReferenceException: 'Object reference not set to an instance of an object.
example not work:
<code>
static void Main(string[] args)
{
// System.NullReferenceException: 'Object reference not set to an instance of an object.
string url = "http://localhost:8080";
using (WebApp.Start(url))
{
Console.WriteLine("Server running on {0}", url);
Console.ReadLine();
}
}
</code>
