ArgumentException: getting control 2's position in a group with only ... Gui.Layout issue.

I am building a chat program for my game and everything is working fine but I am getting this error and I can seem to remove it. here is my script:

     private void OnGUI()
     {
         if (!Client.isConnected)
             return;
 
         Event e = Event.current;
         if (e.type == EventType.keyDown && e.keyCode == KeyCode.Return)
         {
             if (GUI.GetNameOfFocusedControl() == "chat_input")  // if you are focusing on the text field
             {
                 SendMessage();
                 currentMessage = "";
                 Invoke("ScrollToBottom", 0.15f);
                 GUI.FocusControl("");                           // remove focus from textfield
             }
             else if (GUI.GetNameOfFocusedControl() != "chat_input")  // if you are NOT focusing on the text field
             {
                 GUI.FocusControl("chat_input");                 //  focus on the textfield
             }
         }
 
         if (chatHistory.Count > 50)
         {
             chatHistory.RemoveAt(0);
         }
 
         LoadGui();
     }
 
     private void LoadGui()
     {
         GUILayout.BeginArea(new Rect(0, Screen.height - 255, 450, 222));
 
         scrollPosition = GUILayout.BeginScrollView(scrollPosition, GUILayout.Width(450), GUILayout.Height(222));
 
         foreach (var chatMessage in chatHistory)
         {
             if (chatMessage.StartsWith("ThisIsATell"))
             {
                 string msg = BuildMessage(chatMessage);
 
                 GUI.skin = tellSkin;
                 GUILayout.Label(msg, GUILayout.MaxWidth(450));
             }
 
             else if (chatMessage.StartsWith("ThisIsAServerMessage"))
             {
                 string msg = BuildMessage(chatMessage);
 
                 GUI.skin = server_messages_skin;
                 GUILayout.Label(msg, GUILayout.MaxWidth(450));
             }
 
             else if (chatMessage.StartsWith("ThisIsANormalMessage"))
             {
                 string msg = BuildMessage(chatMessage);
 
                 GUI.skin = normalSkin;
                 GUILayout.Label(msg, GUILayout.MaxWidth(450));  // this is the line Unity complains about
             }
         }
 
         GUILayout.EndScrollView();
         GUILayout.EndArea();
 
         GUI.SetNextControlName("chat_input");
         currentMessage = GUI.TextField(new Rect(0, Screen.height - 25, 450, 25), currentMessage);
         currentMessage = Regex.Replace(currentMessage, @"[^a-zA-Z0-9/!?-_ ]", "");
     }

Hope someone knows what wrong here. any help is appreciated.

thanks.