Open SDK在web服务器上运行时不能打开Excel文件，但在本地主机上工作

我有一个c# Web表单应用程序，我想使用Open XML SDK 2.5将gridview的内容导出到excel。这工作完美，当我在本地主机运行，但它不工作，当我移动我的应用程序到UAT web服务器，我没有得到任何错误。我认为这是一个前提错误，但不确定。谢谢你,

 DocumentFormat.OpenXml.Packaging.SpreadsheetDocument spreadsheet;
        DocumentFormat.OpenXml.Spreadsheet.Worksheet worksheet;
        System.IO.StreamReader styleXmlReader;
        string styleXml;
        spreadsheet = Excel.CreateWorkbook(workbookName);
        if (spreadsheet == null)
        {
            return;
        }
        if (createStylesInCode)
        {
            Excel.AddBasicStyles(spreadsheet);
        }
        else
        {
            using (styleXmlReader = new     
  System.IO.StreamReader("PredefinedStyles.xml"))
            {
                styleXml = styleXmlReader.ReadToEnd();
                Excel.AddPredefinedStyles(spreadsheet, styleXml);
            }
        }
        Excel.AddSharedString(spreadsheet, "Shared string");
        Excel.AddWorksheet(spreadsheet, "Test 1");
        Excel.AddWorksheet(spreadsheet, "Test 2");
        worksheet = 
spreadsheet.WorkbookPart.WorksheetParts.First().Worksheet;
        // Headings
        Excel.SetCellValue(spreadsheet, worksheet, 1, 1, "QMS Area", 
true);
        Excel.SetCellValue(spreadsheet, worksheet, 2, 1, "Division 
Owner", true);
        Excel.SetCellValue(spreadsheet, worksheet, 3, 1, "Relevant 
Divisions", true);
        Excel.SetCellValue(spreadsheet, worksheet, 4, 1, "Audit Team", 
true);
        Excel.SetCellValue(spreadsheet, worksheet, 5, 1, "Audit Date", 
true);

        int _rowCount = 2;
        foreach (var audit in _auditDetails)
        {
            // Set Values
            Excel.SetCellValue(spreadsheet, worksheet, 1, 
(uint)_rowCount, audit.QmsArea, true);
            Excel.SetCellValue(spreadsheet, worksheet, 2, 
(uint)_rowCount, audit.DivisionOwner ?? "", true);
            Excel.SetCellValue(spreadsheet, worksheet, 3, 
(uint)_rowCount, audit.RelevantDivision ?? "", true);
            Excel.SetCellValue(spreadsheet, worksheet, 4, 
(uint)_rowCount, audit.AuditTeam ?? "", true);
            Excel.SetCellValue(spreadsheet, worksheet, 5, 
(uint)_rowCount, audit.AuditDate.ToString() ?? "", true);             
            _rowCount++;
        }

        // Set column widths
        Excel.SetColumnWidth(worksheet, 1, 15);
        Excel.SetColumnWidth(worksheet, 2, 20);
        worksheet.Save();
        spreadsheet.Close();

        System.Diagnostics.Process.Start(workbookName);