“/”应用程序中的服务器错误。

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行 17:     {
行 18:         //下载排行榜
行 19:         DataTable dt = DataProvider.Paper.GetPaperList(null, null, IPapers.Attributes.FileDownloadTimes + " desc", 6);
行 20:         JRepeater1.DataSource = dt;
行 21:         JRepeater1.DataBind();

[ArgumentNullException: 值不能为空。
参数名: connectionString]
   AdminWork.Data.SqlHelper.ExecuteDataset(String connectionString, CommandType commandType, String commandText, SqlParameter[] commandParameters) +145
   AdminWork.Data.CommonPage.GetPageList(String connString, CommonPageModel commonPageModel) +95
   Water.Portal.Logic.BLL.PaperBLL.GetPaperList(Hashtable conds, GlobalQuery query, String orderBy, Int32 pageIndex, Int32 pageSize, Int32& recordCount) +912
   Water.Portal.Logic.BLL.PaperBLL.GetPaperList(Hashtable conds, GlobalQuery query, String orderBy, Int32 num) +63
   Controls_PaperRank.Page_Load(Object sender, EventArgs e) in f:\water.portal.web\water.portal.web\Controls\PaperRank.ascx.cs:19
   System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +15
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +34
   System.Web.UI.Control.OnLoad(EventArgs e) +99
   System.Web.UI.Control.LoadRecursive() +47
   System.Web.UI.Control.LoadRecursive() +131
   System.Web.UI.BasePartialCachingControl.LoadRecursive() +113
   System.Web.UI.Control.LoadRecursive() +131
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1061