检索SPListItem时找不到SharePoint组错误

Question

错误日志在代码的这一部分捕获了错误Group Cannot Be Found。

private void GetTreeView(PRDConfig.System SelectedSystem = PRDConfig.System.PRD)
{
    try
    {
        using (SPMonitoredScope scope = new SPMonitoredScope("[{0}]{1}".FormatWith(Location, System.Reflection.MethodBase.GetCurrentMethod().Name)))
        {
            var filePlan = new Mensa.CommonLibrary.FilePlan();
            var FilePlanList = SPHelper.GetListByUrl(PRDConfig.GetString(PRDConfig.Config.FilePlanList,SelectedSystem));
            var listCollection = SortByTitle ? filePlan.GetSortByTitleFilePlan(SelectedSystem) : filePlan.GetSortByReferenceFilePlan(SelectedSystem);

            //Last inserted log
            Log.LogDebug("GetListByUrl : " + PRDConfig.GetString(PRDConfig.Config.FilePlanList, SelectedSystem), Location);

            if (Page.IsPostBack)
                tvFilePlan.Nodes.Clear();

            foreach (SPListItem item in listCollection)
            {
                if (item != null)
                {
                    var node = GetFormattedNode(FilePlanList, item.Folder);
                    tvFilePlan.Nodes.Add(node);
                }
            }
        }
    }
    catch (Exception ex)
    {
        ex.PreserveStackTrace();
        throw;
    }
}

我不确定哪一行引起Group not found错误，因此我想插入更多日志记录。

如何查看上次插入的日志之后正在检查的组？

谢谢。