Invalid object format name.

See more:

C#

ASP.NET

I am trying to upgrade a crystal application from VS.Net 2003 to VS.Net 2008 (v10). Some of the reports work just fine in the new environment. But one of the reports does give me a hard time.
It is a little complicated, so please bear with me. The report uses a c# derived DataSet class as its Database Fields source. It also uses a DataTable as its data source. When I try to bind the report with the data source, for example, myReport.setDataSource(myDataTable);. It throws the following exception (for object format is Number):

InnerException:
{"\rError in File C:\\DOCUME~1\\SASAN\\ASPNET\\LOCALS~1\\Temp\\Template1 {0557D67F-C62D-453F-93F8-E4F14CAD884C}.rpt:\nInvalid object format name."}

StackTrace:
"   at CrystalDecisions.ReportAppServer.ConvertDotNetToErom.ThrowDotNetException(Exception e)\r\n   
at CrystalDecisions.ReportSource.EromReportSourceBase.ExportToStream(ExportRequestContext reqContext)\r\n   
at CrystalDecisions.CrystalReports.Engine.FormatEngine.ExportToStream(ExportRequestContext reqContext)\r\n   
at CrystalDecisions.CrystalReports.Engine.ReportDocument.ExportToStream(ExportOptions options)\r\n   
at CrystalDecisions.CrystalReports.Engine.ReportDocument.ExportToStream(ExportFormatType formatType)\r\n   
at Hit.WebUI.ALL.Report.ReportViewer.ExportReport(ReportDocument rptDoc) in 
D:\\Working\\Ghadr\\WebUI\\ALL\\Report\\ReportViewer.aspx.cs:line 590\r\n   
at Hit.WebUI.ALL.Report.ReportViewer.btnView_Click(Object sender, EventArgs e) in 
D:\\Working\\Ghadr\\WebUI\\ALL\\Report\\ReportViewer.aspx.cs:line 803\r\n   
at System.Web.UI.WebControls.Button.OnClick(EventArgs e)\r\n   
at System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument)\r\n   
at System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument)\r\n   
at System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument)\r\n   
at System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData)\r\n   
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)"