Now, anytime I click on undo or cancel an edit, in any StrataFrame program, including the Business Object mapper, Sample Applications, or my own applications..  I get the following error.

Any Ideas?

Tim

NullReferenceException
 Object reference not set to an instance of an object.

Source     : MicroFour StrataFrame Business

Stack Trace:
   at MicroFour.StrataFrame.Business.BusinessLayer.UndoByForm(BusinessUndoType UndoType)
   at MicroFour.StrataFrame.UI.Windows.Forms.BaseForm.Undo()
   at MicroFour.StrataFrame.UI.Windows.Forms.MaintenanceFormToolStrip.cmdUndo_Click(Object sender, EventArgs e)
   at System.Windows.Forms.ToolStripItem.RaiseEvent(Object key, EventArgs e)
   at System.Windows.Forms.ToolStripButton.OnClick(EventArgs e)
   at System.Windows.Forms.ToolStripItem.HandleClick(EventArgs e)
   at System.Windows.Forms.ToolStripItem.HandleMouseUp(MouseEventArgs e)
   at System.Windows.Forms.ToolStripItem.FireEventInteractive(EventArgs e, ToolStripItemEventType met)
   at System.Windows.Forms.ToolStripItem.FireEvent(EventArgs e, ToolStripItemEventType met)
   at System.Windows.Forms.ToolStrip.OnMouseUp(MouseEventArgs mea)
   at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.ScrollableControl.WndProc(Message& m)
   at System.Windows.Forms.ToolStrip.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)