I have an excel workbook with several named references defined.  The workbook opens fine in Excel.  However an exception is thrown when I try to load it using Infragistics.Excel.Workbook.Load (see details below).  Attached is a sample project.

message: {"The name to find cannot be null or empty.\r\nParameter name: name"}

stack trace:

   at Infragistics.Excel.NamedReferenceCollection.Find(String name, Object scope)
   at Infragistics.Excel.FormulaUtilities.Tokens.NameToken.GetCalcValue(Workbook workbook, IWorksheetCell formulaOwner)
   at Infragistics.Excel.FormulaUtilities.CalcEngine.CalcEngineTokenConverter.ConvertOperandToken(OperandToken operandToken, ExcelCalcFormula formula, Workbook workbook)
   at Infragistics.Excel.FormulaUtilities.CalcEngine.CalcEngineTokenConverter.ConvertToken(FormulaToken token, ExcelCalcFormula formula, Workbook workbook)
   at Infragistics.Excel.FormulaUtilities.CalcEngine.CalcEngineTokenConverter.ConvertTokens(ExcelCalcFormula formula, Workbook workbook)
   at Infragistics.Excel.Workbook.CompileFormula(IExcelCalcReference baseReference, Formula excelFormula)
   at Infragistics.Excel.FormulaUtilities.CalcEngine.ExcelRefBase.SetAndCompileFormula(Formula newExcelFormula, Boolean canClearPreviouslyCalculatedValue)
   at Infragistics.Excel.Workbook.ResumeCalculations(Boolean doFirstEvaluationIfInManualMode)
   at Infragistics.Excel.Workbook.LoadHelper(Stream stream, WorkbookFormat format, String parameterName, IPackageFactory packageFactory, Boolean verifyExcel2007Xml)
   at Infragistics.Excel.Workbook.Load(String fileName, IPackageFactory packageFactory, Boolean verifyExcel2007Xml)
   at Infragistics.Excel.Workbook.Load(String fileName)
   at WindowsFormsApplication1.Form1.ultraButton1_Click(Object sender, EventArgs e) in C:\Documents and Settings\araman99\Desktop\WindowsFormsApplication1\WindowsFormsApplication1\Form1.cs:line 24
   at System.Windows.Forms.Control.OnClick(EventArgs e)
   at Infragistics.Win.UltraControlBase.OnClick(EventArgs e)
   at Infragistics.Win.Misc.UltraButtonBase.OnClick(EventArgs e)
   at Infragistics.Win.Misc.UltraButton.OnMouseUp(MouseEventArgs e)
   at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
   at System.Windows.Forms.Control.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.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
   at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
   at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32 reason, Int32 pvLoopData)
   at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
   at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
   at System.Windows.Forms.Application.Run(Form mainForm)
   at WindowsFormsApplication1.Program.Main() in C:\Documents and Settings\araman99\Desktop\WindowsFormsApplication1\WindowsFormsApplication1\Program.cs:line 18
   at System.AppDomain._nExecuteAssembly(Assembly assembly, String[] args)
   at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
   at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
   at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Threading.ThreadHelper.ThreadStart()