Using TreeView with a Site Map

I have a simple Web.sitemap file that Im trying to build a TreeView site map around:

<?xml version="1.0" encoding="utf-8" ?>
<siteMap xmlns="http://schemas.microsoft.com/AspNet/SiteMap-File-1.0" >
    <siteMapNode url="~/Default.aspx" title="Home">
         <siteMapNode url="~/CreateLogin.aspx"  title="Create an Account" />
         <siteMapNode url="~/Login.aspx"  title="Login" />
    </siteMapNode>
</siteMap>

Ive dragged a SiteMapDataSource control to the page and then a TreeVeiw control.   But as soon as I link the TreeView control to the SiteMapDataSource the TreeView control shows:

"Error parsing control: A relative URI cannot be created because the uriString parameter represents an absolute URI."

I dont see any absolute URIs in what Ive written so this doesnt make sense to me. Does anyone know what might be going on?

Thanks
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