MVC :: Route Debugger By Stephen Walther?

I'm trying to follow Stephen Walther's MVC tip: Build a Controller to Debug Your Custom Routes (http://stephenwalther.com/blog/archive/2008/08/03/asp-net-mvc-tip-29-build-a-controller-to-debug-your-custom-routes.aspx) but I'm getting this error "Object reference not set to an instance of an object." when getting the values of the RouteTable.

Function Index() As ActionResult
Dim context As HttpContextBase = Me.ControllerContext.HttpContext
Dim sb As New StringBuilder
For Each namedRoute As Route In RouteTable.Routes
'Dim dataTokens = formatValues(namedRoute.Defaults) 'this looks good
Dim rd = namedRoute.GetRouteData(context)
'sb.Append(dataTokens & "<br>") 'this looks good
sb.Append(formatValues(rd.Values)) 'this one is not, error here [:(]
Next
End Function
Private Function formatValues(ByVal values As RouteValueDictionary) As String
If values Is Nothing Then
Return "N/A"
End If
Dim col = New List(Of [String])()
For Each key As String In values.Keys
Dim value As Object = If(values(key), Nothing)
col.Add((key & "=") + value.ToString())
Next
Return String.Join(", ", col.ToArray())
End Function

You have to reference the debugger file (RouteDebugger.dll) provided by Stephen.

I'm trying to get the Route Name's for each controller.