Online Chat doesn't work

public class Chat : MonoBehaviour {

 bool usingChat = false;
 bool showChat = false;

 string inputField = "";

 Vector2 ScrollPosition;
 int width = 500;
 int height = 100;
 string playerName;
 float LastOnFocusedtime = 0;
 Rect window;

 ArrayList playerList = new ArrayList ();
 class PlayerNode
 {
     public string PlayerName;
     public NetworkPlayer player;
 }

 ArrayList chatEntries = new ArrayList();
 class ChatEntry
 {
     public string name = "";
     public string text = "";
 }

 // Use this for initialization
 void Start () 
 {
     window = new Rect(Screen.width /2 - width /2, Screen.height - height + 5, width, height);
     playerName = PlayerPrefs.SetString("Playername", "");

     if(playerName == "") playerName = "RandomName" + Random.Range(1, 999);
 }

 void OnConnectedToServer()
 {
     ShowChatWindow();
     networkView.RPC("TellServerOurName", RPCMode.Server, playerName);
     addGameChatMessage(playerName + " Have just joined the chat");
 }

 void OnServerInitialized()
 {
     showChatWindow();
     PlayerNode newEntry = new PlayerNode();
     newEntry.PlayerName = playerName;
     newEntry.player = Network.player;
     playerList.Add(newEntry);
     addGameChatMessage(playerName + " Have just joined the chat");
 }

 PlayerNode GetPlayerNode(NetworkPlayer netPlay)
 {
     foreach (PlayerNode entry in playerList)
     {
         if(entry.player == netPlay)
             return entry;
     }
     Debug.LogError("GetPlayerNode: Requested a playernode of non-existing player!");
     return null;
 }

 void OnPlayerDisconnected(NetworkPlayer netplayer)
 {
     addGameChatMessage("A player has disconected");
     playerList.Remove(GetPlayerNode(netplayer));
 }

 void OnDisconectedFromServer()
 {
     CloseChatWindow();  
 }

 [RPC]
 void TellServerOurName(String name, NetworkMessageInfo info)
 {
     PlayerNode newEntry = new PlayerNode();
     newEntry.PlayerName = playerName;
     newEntry.player = Network.player;
     playerList.Add(newEntry);
     addGameChatMessage(playerName + "has joined the Chat!");
 }

 void CloseChatWindow()
 {
     showChat = false;
     inputField = "";
     chatEntries = new ArrayList();
 }

 void ShowChatWindow()
 {
     showChat = true;
     inputField = "";
     chatEntries = new ArrayList();
 }

 void OnGUi()
 {
     if(!showChat) return;

     if(Event.current.type == EventType.keyDown && Event.current.character == '\n' & inputField.Length <=0)
     {
         if(LastOnFocusedtime + .25f < Time.time)
         {
             usingChat = true;
             GUI.FocusWindow(5);
             GUI.FocusControl("Chat input field");
         }
     }

     window = GUI.Window(5, window, GlobalChatwindow, "");
 }

 void GlobalChatWindow(int id)
 {
     GUILayout.BeginVertical();
     GUILayout.Space(10);
     GUILayout.EndVertical();

     ScrollPosition = GUILayout.BeginScrollView(ScrollPosition);

     foreach (ChatEntry entry in chatEntries)
     {
         GUILayout.BeginHorizontal();
         if(entry.name == " - ")
             GUILayout.Label(entry.name + entry.text);
         else
             GUILayout.Label(entry.name + ": " + entry.text);

         GUILayout.EndHorizontal();
         GUILayout.Space(2);
     }

     GUILayout.EndScrollView();

     if(Event.current.type == EventType.keyDown && Event.current.character == '\n' & inputField.Length > 0)
         HitEnter(inputField);

     GUI.SetNextControlName("Chat input field");
     inputField = GUILayout.TextField(inputField);

     if(Input.GetKeyDown("mouse 0"))
     {
         if(usingChat)
         {
             usingChat = false;
             GUI.UnfocusWindow();
             LastOnFocusedtime = Time.time;
         }
     }

     void HitEnter (string msg)
     {
         msg = msg.Replace('\n', ' ');
         networkView.RPC("ApplyGobalChatText", RPCMode.All, playerName, msg);
     }

     [RPC]
     void ApplyGlobalChatText(String name,String msg)
     {
         ChatEntry entry = new ChatEntry();
         entry.name = name;
         entry.text = msg;

         chatEntries.Add(entry);

         if(chatEntries.Count > 4)
             chatEntries.RemoveAt(0);

         ScrollPosition.y = 1000000;
         inputField = "";
         }

         void addGameChatMessage(string str)
         {
             ApplyGlobalChatText(" . ", str);
             if (Network.connections.Length > 0);
                 networkView.RPC("ApplyGlobalChatText", RPCMode.Others, " . ", str);
         }
 }