The following web control will not convert for some reason (add designer and cs pages). I am getting a page directive is missing error What is wrong with the code that is causing it to not convert?

<%@ Control Language="C#" AutoEventWireup="true" %>
<%@ Register TagPrefix="ipam" TagName="tnavbar" src="~/controls/tnavbar.ascx" %>

<script language="C#" runat="server">
string strCurrent = "";
string strDepth = "";

public string Current
{
  get { return strCurrent; }
  set { strCurrent = value; }
}


public string Depth
{
  get { return strDepth; }
  set { strDepth = value; }
}

void Page_Load(Object sender, EventArgs e) {
  idTnavbar.Current = strCurrent;
  idTnavbar.Item1Link = strDepth + idTnavbar.Item1Link;
  idTnavbar.Item2Link = strDepth + idTnavbar.Item2Link;
  idTnavbar.Item3Link = strDepth + idTnavbar.Item3Link;
  idTnavbar.Item4Link = strDepth + idTnavbar.Item4Link;
  idTnavbar.Item5Link = strDepth + idTnavbar.Item5Link;
  idTnavbar.Item6Link = strDepth + idTnavbar.Item6Link;
  idTnavbar.Item7Link = strDepth + idTnavbar.Item7Link;
}
</script>
<ipam:tnavbar id="idTnavbar" 
    Item1="2000 -- 2001"
    Item1Link="2000_--_2001.aspx" 
    Item2="2001 -- 2002" 
    Item2Link="2001_--_2002.aspx" 
    Item3="2002 -- 2003" 
    Item3Link="2002_--_2003.aspx" 
    Item4="2003 -- 2004" 
    Item4Link="2003_--_2004.aspx" 
    Item5="2004 -- 2005" 
    Item5Link="2004_--_2005.aspx" 
    Item6="2005 -- 2006" 
    Item6Link="2005_--_2006.aspx" 
    Item7="2006 -- 2007" 
    Item7Link="2006_--_2007.aspx" 
    runat="server" />

Please help, if I can solve this issue many more pages will be fixed to.