The handle is invalid. (Exception from HRESULT: 0x80070006 (E_HANDLE))

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ASP.NET

Actually i am getting this error in my website while viewing the document in Production site...but when i am testing in local system it is not coming so can any one say what was the problem...........and here one more thing it is not coming to every user for one user it is coming.....

Here is my code

if (path != "")
                           {
                               Response.ClearHeaders();
                               Response.ContentType = "application/octet-stream";

                               if ((Request.Browser.Browser.ToLower() == "ie") && (Request.Browser.MajorVersion < 9))
                               {
                                   Response.Cache.SetCacheability(HttpCacheability.Private);
                                   Response.Cache.SetMaxAge(TimeSpan.FromMilliseconds(1));
                               }
                               else
                               {
                                   Response.Cache.SetCacheability(HttpCacheability.NoCache);//IE set to not cache
                                   Response.Cache.SetNoStore();//Firefox/Chrome not to cache
                                   Response.Cache.SetExpires(DateTime.UtcNow); //for safe measure expire it immediately
                               }

                               Response.AppendHeader("Content-Disposition", "attachment; filename=" + fileName);
                               Response.TransmitFile(strURL);
                               string Viewed = "Viewed  - " + fileName;

                               obj.UserId = Session["UserId"].ToString();
                               obj.DocAccess = Viewed;
                               obj.PageType = "Web";
                               obj.Message = Session["UserID"] + "  has viewed the CCD document " + fileName;
                               int i = NlogObj.Logstore(obj);


                               HttpContext.Current.ApplicationInstance.CompleteRequest();
                           }