ArgumentException: Getting control 2's position in a group with only 2 controls when doing mouseDown

Hey,

I've created a script that enters a text string, created in another script, into a chat box window with scrollview.

I get the following error message, even though the program seems to work like it should:

ArgumentException: Getting control 2's position in a group with only 2 controls when doing mouseDown Aborting

UnityEngine.GUILayoutGroup.GetNext () UnityEngine.GUILayoutUtility.BeginLayoutGroup (UnityEngine.GUIStyle style, UnityEngine.GUILayoutOption[] options, System.Type LayoutType) [0x00000] UnityEngine.GUILayout.BeginHorizontal (UnityEngine.GUIStyle style, UnityEngine.GUILayoutOption[] options) [0x00000] UnityEngine.GUILayout.BeginHorizontal (UnityEngine.GUILayoutOption[] options) [0x00000] Chat.GlobalChatWindow (Int32 id) (at Assets\Example1\Chat.js:250) UnityEngine.GUI+_Window.Do () UnityEngine.GUI.BeginWindows (UnityEngine.Event e, Int32 skinMode, UnityEngine.IDList idlist, Int32 editorWindowInstanceID)

The only thing that does not work is that the scroll window does not automatically scroll down to show the last entry (but it does scroll to show the second-to-last entry).

I've used the M2H Networking Project, the companion project to the pdf "Unity networking; the Zero to Hero guide". In it, I've added my own RPC script:

@RPC
function RollCall(name : String, total : String, dice : String) {
    addGameChatMessage(name+" rolls "+total+", on "+dice);
}

The addGameChatMessage function, for reference:

function addGameChatMessage(str : String){ ApplyGlobalChatText("", str); if(Network.connections.length>0){ networkView.RPC("ApplyGlobalChatText", RPCMode.Others, "", str); } }

 @RPC
 function ApplyGlobalChatText (name : String, msg : String)
 {
     var entry = new ChatEntry();
     entry.name = name;
     entry.text = msg;

     chatEntries.Add(entry);

     //Remove old entries
     if (chatEntries.Count > 300){
         chatEntries.RemoveAt(0);
     }

     scrollPosition.y = 1000000; 
 }

The RollCall function is called inside the function of a window, called GlobalChatWindow. The script basically checks to see if anything is stored in MouseInformer.dList and if there is, this data is cleared and a chat message is generated. In my own script the MouseInformer.dList contents are gathered into strings and send to the RollCall function, but since this has nothing to do with the exception, I've removed the code responsible for that:

function GlobalChatWindow (id : int) {

 GUILayout.BeginVertical();
 GUILayout.Space(5);
 GUILayout.EndVertical();

 // Begin a scroll view. All rects are calculated automatically - 
 // it will use up any available screen space and make sure contents flow correctly.
 // This is kept small with the last two parameters to force scrollbars to appear.
 scrollPosition = GUILayout.BeginScrollView (scrollPosition);

 for (var entry : ChatEntry in chatEntries)
 {
     GUILayout.BeginHorizontal(); //UNITY SAYS THIS IS WHERE THE EXCEPTION ORIGINATES
     if(entry.name==""){//Game message
         GUILayout.Label (entry.text);
     }else{
         GUILayout.Label (entry.name+": "+entry.text);
     }
     GUILayout.EndHorizontal();
     GUILayout.Space(-5);

 }
 // End the scrollview we began above.
 GUILayout.EndScrollView ();

 var mouseInformer : MouseInformer = GetComponent("MouseInformer");
 if (checkWindow.Contains(Input.mousePosition) && Input.GetMouseButtonDown(0) && mouseInformer.dList.length > 0) {

     mouseInformer.ClearAll();
     //networkView.RPC("RollCall", RPCMode.All, playerName, outputTotal+"", diceTypeString);
     networkView.RPC("RollCall", RPCMode.All, playerName, "Result", "Many dice");

 }

 if (Event.current.type == EventType.keyDown && Event.current.character == "\n" && inputField.Length > 0)
 {
     HitEnter(inputField);
 }
 GUI.SetNextControlName("Chat input field");
 inputField = GUILayout.TextField(inputField);

}