导出的pdf文件报错

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PrintInfo printInfo = new PrintInfo();
         printInfo.ShowBorder = false;
         printInfo.FooterCenter = "Page &P of &N";
         printInfo.ShowRowHeader = VisibilityType.Hide;
         printInfo.ShowColumnHeader = VisibilityType.Hide;
         printInfo.FitPagesWide = -1;
         printInfo.FitPagesTall = -1;
         printInfo.ShowGridLine = false;
         printInfo.HeaderCenter = "&A of &F";
         printInfo.HeaderLeft = "&KFFFF00Color &KFF0000RedColor";
         printInfo.BestFitColumns = true;
         printInfo.UseMax = true;
         foreach (var item in this.Gcspread1.Sheets)
         {
            item.PrintInfo = null;
         }
         foreach (var item in this.Gcspread1.Sheets)
         {
            item.PrintInfo = printInfo;
         }
         GrapeCity.Windows.SpreadSheet.Data.PdfExportSettings test;
         test = new GrapeCity.Windows.SpreadSheet.Data.PdfExportSettings();
         test.Title = "Print PDF";
         test.Author = "奎屯公路, Inc.";
         test.DisplayDocTitle = true;
         test.FitWindow = true;
         var stream = File.OpenWrite(@"D:\aaa.pdf");
         Gcspread1.SavePdf(stream, test,new int[]{0,1});
         stream.Dispose();

用这种方式导出的pdf文件打开报错，