Error: Exception has been thrown by the target of an invocation.

mostafa h.mostafa h.
edited 4:14PM in FastReport .NET
Please Help me:

What is the problem?

Exception has been thrown by the target of an invocation.
at System.RuntimeMethodHandle._InvokeMethodFast(IRuntimeMethodInfo method, Object target, Object[] arguments, SignatureStruct& sig, MethodAttributes methodAttributes, RuntimeType typeOwner)
at System.RuntimeMethodHandle.InvokeMethodFast(IRuntimeMethodInfo method, Object target, Object[] arguments, Signature sig, MethodAttributes methodAttributes, RuntimeType typeOwner)
at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean skipVisibilityChecks)
at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
at System.Reflection.MethodBase.Invoke(Object obj, Object[] parameters)
at FastReport.Code.ExpressionDescriptor.Invoke(Object[] parameters)
at FastReport.Code.AssemblyDescriptor.InvokeEvent(String name, Object[] parms)
at FastReport.Report.InvokeEvent(String name, Object[] parms)
at FastReport.Base.InvokeEvent(String name, Object param)
at FastReport.ReportComponentBase.OnBeforePrint(EventArgs e)
at FastReport.BandBase.SaveState()
at FastReport.Engine.ReportEngine.ShowBandToPreparedPages(BandBase band, Boolean getData)
at FastReport.Engine.ReportEngine.ShowBand(BandBase band, Boolean getData)
at FastReport.Engine.ReportEngine.ShowDataBand(DataBand dataBand, Int32 rowCount)
at FastReport.Engine.ReportEngine.RunDataBand(DataBand dataBand, Int32 rowCount, Boolean keepFirstRow, Boolean keepLastRow)
at FastReport.Engine.ReportEngine.RunDataBand(DataBand dataBand)
at FastReport.Engine.ReportEngine.RunBands(BandCollection bands)
at FastReport.Engine.ReportEngine.RunReportPage(ReportPage page)
at FastReport.Engine.ReportEngine.RunReportPages()
at FastReport.Engine.ReportEngine.RunReportPages(ReportPage page)
at FastReport.Engine.ReportEngine.Run(Boolean runDialogs, Boolean append, Boolean resetDataState, ReportPage page)
at FastReport.Report.Prepare(Boolean append)
at FastReport.Report.Prepare()
at utilsClass.myPrintSetting.printFactorOrder(orderClass _order, Int32 _factorTypeID, Boolean designMode)
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