Server Error in '/' Application.

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Line 6:          <asp:Repeater runat="server" ID="rptBreadCrumb">
Line 7:              <ItemTemplate>
Line 8:                  <li><a href="<%# extools.ReWriterPath(Eval("Kurl").ToString(), "urun-gruplarimiz",lang) %>"><%# Eval("KategoriAdi") %></a></li>
Line 9:              </ItemTemplate>
Line 10:         </asp:Repeater>       

[NullReferenceException: Object reference not set to an instance of an object.]
   ASP.usercontrols_tr_urunler_breadcrumb_ascx.__DataBind__control3(Object sender, EventArgs e) in c:\inetpub\vhosts\turquagro.com\httpdocs\UserControls\tr\urunler-breadcrumb.ascx:8
   System.Web.UI.Control.OnDataBinding(EventArgs e) +99
   System.Web.UI.Control.DataBind(Boolean raiseOnDataBinding) +177
   System.Web.UI.Control.DataBindChildren() +248
   System.Web.UI.Control.DataBind(Boolean raiseOnDataBinding) +195
   System.Web.UI.WebControls.Repeater.CreateItem(Int32 itemIndex, ListItemType itemType, Boolean dataBind, Object dataItem) +174
   System.Web.UI.WebControls.Repeater.AddDataItemsIntoItemsArray(IEnumerable dataSource, Boolean useDataSource) +291
   System.Web.UI.WebControls.Repeater.PostGetDataAction(IEnumerable dataSource) +109
   System.Web.UI.WebControls.Repeater.OnDataBinding(EventArgs e) +81
   urun_breadcrumb.Page_Load(Object sender, EventArgs e) in c:\inetpub\vhosts\turquagro.com\httpdocs\UserControls\tr\urunler-breadcrumb.ascx.cs:41
   System.Web.UI.Control.OnLoad(EventArgs e) +108
   System.Web.UI.Control.LoadRecursive() +90
   System.Web.UI.Control.LoadRecursive() +185
   System.Web.UI.Control.LoadRecursive() +185
   System.Web.UI.Control.LoadRecursive() +185
   System.Web.UI.Control.LoadRecursive() +185
   System.Web.UI.Control.LoadRecursive() +185
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1602