CommandLine Parser Issue

Program.cs

using System;
using CommandLine;
using CommandLine.Text;
using System.Collections.Generic;
					
/*
Output:

push-registration.exe register
Push Helper 1.0

ERROR(S):
  A value not bound to option name is defined with a bad format.
  A required value not bound to option name is missing.
USAGE:
Normal scenario:
  push-registration register <token> <tags>

...

Expected: 

Normal scenario:
  push-registration register iOS <token> <tags>
*/
					
public class Program
{
	public static int Main(string[] args)
	{
		args = new[] { "--help" };
		return Parser.Default.ParseArguments<RegisterOptions>(args)
                .MapResult(HandleRegister, errs => 1);
	}
	private static int HandleRegister(RegisterOptions options)
    {
		// do stuff
		return 0;
	}
	
	public class VerbOptionsBase
    {
        [Option("connectionString", Default = "conn", HelpText = "Connection string to Azure")]
        public string ConnectionString { get; set; }

        [Option("hub", Default = "hub", HelpText = "Hub Name within the connection string")]
        public string HubName { get; set; }
    }

    [Verb("register", HelpText = "Registers a device with Azure for push")]
    public class RegisterOptions : VerbOptionsBase
    {
        [Usage]
        public static IEnumerable<Example> Examples
        {
            get
            {
                yield return new Example("Normal scenario", new RegisterOptions { Platform = PlatformType.iOS, PushToken = "<token>", Tags = new[] { "<tags>" } });
            }
        }

        public enum PlatformType
        {
            iOS,
            Android
        }

        [Value(0, MetaName = "platform", HelpText = "Platform associated wth push token. iOS/Android supported.", Required = true)]
        public PlatformType Platform { get; set; }

        [Value(1, MetaName = "token", HelpText = "The push token", Required = true)]
        public string PushToken { get; set; }

        [Value(2, MetaName = "tags", HelpText = "Tags associated with registration", Required = false)]
        public IEnumerable<string> Tags { get; set; }
    }
}