The server threw an exception. (Exception from HRESULT: 0x80010105 (RPC_E_SERVERFAULT))

 //Make the string for opening project file from server
          string sProjectName = @"<>\" + ds.Tables["Rep"].Rows[i]["PROJECTNAME"].ToString() + "";
          
          object oMissing = System.Reflection.Missing.Value;
          
          //Set the properties to avoid message prompt on server side
          app.DisplayAlerts = false;
          app.DisplayScheduleMessages = false;
          app.DisplayWizardErrors = false;
          app.Visible = false;
          
          app.FileOpenEx(sProjectName, false, oMissing, oMissing, oMissing, oMissing, oMissing, oMissing, oMissing,
                  "MSProject.PSI.12", oMissing, Microsoft.Office.Interop.MSProject.PjPoolOpen.pjPoolReadWrite, oMissing, oMissing, oMissing, oMissing, oMissing);