Undo and Redo Exception in BitmapViewer using Remoting Scripting

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using Aurigma;
using Aurigma.GraphicsMill;
using Aurigma.GraphicsMill.WebControls;

namespace TestingIt
{
	/// <summary>
	/// Summary description for WebForm1.
	/// </summary>
	public class WebForm1 : System.Web.UI.Page
	{
		protected Aurigma.GraphicsMill.WebControls.RectangleRubberband RectangleRubberband1;
		protected System.Web.UI.WebControls.Button BtnUndo2;
		protected Aurigma.GraphicsMill.WebControls.BitmapViewer BitmapViewer1;
	
		private void Page_Load(object sender, System.EventArgs e)
		{
			if (!this.IsPostBack)
			{
				BitmapViewer1.Bitmap.UndoRedoEnabled = true;
				BitmapViewer1.Bitmap.Load(Server.MapPath("/TestingIt/UploadedImages/MeltDown.jpg"));
				BitmapViewer1.Bitmap.SaveState();
			}
		}

		#region Web Form Designer generated code
		override protected void OnInit(EventArgs e)
		{
			//
			// CODEGEN: This call is required by the ASP.NET Web Form Designer.
			//
			InitializeComponent();
			base.OnInit(e);
		}
		
		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		private void InitializeComponent()
		{    
			this.Load += new System.EventHandler(this.Page_Load);

		}
		#endregion

		[RemoteScriptingMethod]
		public void Crop(int Top, int Left, int Width, int Height)
		{
			BitmapViewer1.Bitmap.Transforms.Crop(Top, Left, Width, Height);
			BitmapViewer1.Bitmap.SaveState();
		}

		[RemoteScriptingMethod]
		public void Rotate(int Degrees)
		{
			BitmapViewer1.Bitmap.Transforms.Rotate(Degrees);
			BitmapViewer1.Bitmap.SaveState();
		}

		[RemoteScriptingMethod]
		public void AdjustBrightness(float BrightnessAmount, float ContrastAmount)
		{
			BitmapViewer1.Bitmap.ColorAdjustment.BrightnessContrast(BrightnessAmount,ContrastAmount);
			BitmapViewer1.Bitmap.SaveState();
		}

		[RemoteScriptingMethod]
		public void Resize(int Width, int Height)
		{
			BitmapViewer1.Bitmap.Transforms.Resize(Width,Height);
			BitmapViewer1.Bitmap.SaveState();
		}

		[RemoteScriptingMethod]
		public void Undo()
		{
			try
			{
				BitmapViewer1.Bitmap.Undo();
			}
			catch(System.Exception ex)
			{
				Console.WriteLine(ex.Message);
			}
		}

		[RemoteScriptingMethod]
		public void Redo()
		{
			BitmapViewer1.Bitmap.Redo();
		}
	}
}