Lidgren - Can't run the examples

Hey everybody. At the moment I'm experimenting with Lidgren and XNA.
Whenever I try to call NetServer.Start() I get a SocketException.

Here's my code:

Code:

using System;
using System.Collections.Generic;
using System.Linq;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Audio;
using Microsoft.Xna.Framework.Content;
using Microsoft.Xna.Framework.GamerServices;
using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework.Input;
using Microsoft.Xna.Framework.Media;

using Lidgren.Network;

namespace Gravel
{
    public class Game1 : Microsoft.Xna.Framework.Game
    {
        GraphicsDeviceManager graphics;
        SpriteBatch spriteBatch;

        NetClient client;
        Texture2D playerTexture;
        Dictionary<long, NetworkedPlayer> players = new Dictionary<long, NetworkedPlayer>();

        public Game1()
        {
            graphics = new GraphicsDeviceManager(this);
            Content.RootDirectory = "Content";

            NetPeerConfiguration config = new NetPeerConfiguration("Gravel");
            config.EnableMessageType(NetIncomingMessageType.DiscoveryResponse);

            client = new NetClient(config);
            client.Start();
        }

        protected override void Initialize()
        {
            client.DiscoverKnownPeer("10.118.0.1", 9999);

            base.Initialize();
        }

        protected override void LoadContent()
        {
            // Create a new SpriteBatch, which can be used to draw textures.
            spriteBatch = new SpriteBatch(GraphicsDevice);

            // TODO: use this.Content to load your game content here
            playerTexture = Content.Load<Texture2D>("Player");
        }

        protected override void UnloadContent()
        {
            // TODO: Unload any non ContentManager content here
            client.Shutdown("bye");
        }

        protected override void Update(GameTime gameTime)
        {
            // Allows the game to exit
            if (GamePad.GetState(PlayerIndex.One).Buttons.Back == ButtonState.Pressed)
                this.Exit();

            // Movement Code
            int xInput = 0;
            int yInput = 0;

            if (Keyboard.GetState().IsKeyDown(Keys.W))
                yInput -= 1;
            else if (Keyboard.GetState().IsKeyDown(Keys.S))
                yInput += 1;

            if (xInput != 0 || yInput != 0)
            {
                NetOutgoingMessage message = client.CreateMessage();
                message.Write(xInput);
                message.Write(yInput);
                client.SendMessage(message, NetDeliveryMethod.Unreliable);
            }

            // Read Messages
            NetIncomingMessage incomingMessage;

            while ((incomingMessage = client.ReadMessage()) != null)
            {
                if (incomingMessage.MessageType == NetIncomingMessageType.DiscoveryResponse)
                {
                    client.Connect(incomingMessage.SenderEndPoint);
                }
                else if (incomingMessage.MessageType == NetIncomingMessageType.Data)
                {
                    long who = incomingMessage.ReadInt64();
                    int x = incomingMessage.ReadInt32();
                    int y = incomingMessage.ReadInt32();

                    if (!players.Keys.Contains(who))
                    {
                        players.Add(who, new NetworkedPlayer(playerTexture));
                    }

                    players[who].position = new Vector2(x, y);
                }
            }

            base.Update(gameTime);
        }

        protected override void Draw(GameTime gameTime)
        {
            GraphicsDevice.Clear(Color.CornflowerBlue);

            spriteBatch.Begin();

            // Draw All Players
            foreach (NetworkedPlayer player in players.Values)
            {
                player.Draw(spriteBatch);
            }

            spriteBatch.End();

            base.Draw(gameTime);
        }
    }
}

The error message:

Code:

System.Net.Sockets.SocketException was unhandled
  HResult=-2147467259
  Message=An invalid argument was supplied
  Source=System
  ErrorCode=10022
  NativeErrorCode=10022
  StackTrace:
       at System.Net.Sockets.Socket..ctor(AddressFamily addressFamily, SocketType socketType, ProtocolType protocolType)
       at Lidgren.Network.NetPeer.InitializeNetwork() in l:\Lidgren Stuff\lidgren-network-gen3-2013-05-07\Lidgren-network-gen3\Lidgren.Network\NetPeer.Internal.cs:line 117
       at Lidgren.Network.NetPeer.Start() in l:\Lidgren Stuff\lidgren-network-gen3-2013-05-07\Lidgren-network-gen3\Lidgren.Network\NetPeer.cs:line 139
       at Gravel.Game1..ctor() in l:\C++\Projects\Tutorial\RPG\Gravel\Gravel\Gravel\Game1.cs:line 34
       at Gravel.Program.Main(String[] args) in l:\C++\Projects\Tutorial\RPG\Gravel\Gravel\Gravel\Program.cs:line 13
  InnerException:

I can't find any help on Google and I'm at a dead end. Any help would be appreciated.

Thanks for reading.