hi eyevy1: When I run my app in my computer's IE,display errormessage as below(but yesterday my app eyerything is ok!): Error in File c:\inetpub\wwwroot\hhmxposystem\report\crReportPo.rpt: Error detected by export DLL: Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: CrystalDecisions.CrystalReports.Engine.ExportException: Error in File c:\inetpub\wwwroot\hhmxposystem\report\crReportPo.rpt: Error detected by export DLL: Source Error: ine 48: .ExportFormatType = CrystalDecisions.[Shared].ExportFormatType.PortableDocFormat Line 49: End With Line 50: crReportDocPo.Export() Line 51: 'With HttpContext.Current 'don't display the word,but can save the file Line 52: ' .Current.Response.ClearHeaders() so what's problem ? how can I to slove it ? thanks in advanced!