在服务器上发布excel interop不起作用

在当地工作很好，

Thread.CurrentThread.CurrentCulture = new CultureInfo("en-US"); Application excel = null; Workbook wb = null; excel = new Application(); excel.Visible = false; excel.DisplayAlerts = false; excel.AlertBeforeOverwriting = false; wb = excel.Workbooks.Open(Server.MapPath(fileName), Type.Missing, false, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing); wb.Save(); wb.Close(false, null, null); excel.Quit(); 

在服务器Windows 7 Ultimate x64上发布后，我得到了这个问题：

 Microsoft Office Excel cannot access the file: /// There are several possible reasons: • The file name or path does not exist. • The file is being used by another program. • The workbook you are trying to save has the same name as a currently open workbook. 

如何解决这个问题呢：