Content Placeholders

I have a couple of templates based off a master. I am trying to add content using  'ContentPlaceHolder'. See the last couple of lines:

<asp:ContentPlaceHolder Id="ankle" runat="server">
	</asp:ContentPlaceHolder>

I have refrenced this in a nested template like this, but I am getting an error previewing the page.

<%@ Master Language="C#" MasterPageFile="~/masterpages/NewsInternalPage.master" AutoEventWireup="true" %>

<asp:content ContentPlaceHolderId="headContent" runat="server">
	<link rel="stylesheet" type="text/css" href="/css/smallSlider.css">
	<script src="//ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
	<script src="/scripts/bxslider.js"></script>
	<script>
		$(document).ready(function(){
			  $('.bxslider').bxSlider({
				  slideMargin:0,
				  auto: true,
				  pause: 6000,
				  slideWidth: 180,
				  minSlides: 1,
				  maxSlides: 3,
				  pager: false,
				  controls: true,
				  speed:1000,
				  pager:false,
				  pagerType:'full'
			  });
		});
	</script>
  <!--
  <sc ript type="text/javascript" src="/scripts/news-category.js"></sc ript>
  -->
  
  <asp:ContentPlaceHolder Id="headContent" runat="server">
  </asp:ContentPlaceHolder>
</asp:content>

<asp:content ContentPlaceHolderId="bodyContent" runat="server">
	<div id="category-content">
	<umbraco:Item field="categoryContent" runat="server" />
	</div>
  <umbraco:Macro Alias="NewsCategory" runat="server"></umbraco:Macro>
	<asp:content ContentPlaceHolderId="ankle" runat="server">
		<div class="sliderData">
			<umbraco:Item field="smallSlider" runat="server" />
		</div>
	</asp:content>
	
</asp:content>
	

<%@ Master Language="C#" MasterPageFile="~/masterpages/BasePage.master" AutoEventWireup="true" %>

<asp:content ContentPlaceHolderId="headContent" runat="server">
  <link rel="stylesheet" href="/css/footer.css" type="text/css" />
  
  <asp:ContentPlaceHolder Id="headContent" runat="server">
  </asp:ContentPlaceHolder>
</asp:content>

<asp:content ContentPlaceHolderId="bodyContent" runat="server">
  <div id="heightDiv">
    <asp:ContentPlaceHolder Id="bodyContent" runat="server">
    </asp:ContentPlaceHolder>
	  
  </div>
  <asp:ContentPlaceHolder Id="ankle" runat="server">
	</asp:ContentPlaceHolder>
</asp:content>