Is the file "DreamweaverCtrls.dll" in the bin subfolder of your root folder?
Following code is not tested:
open page frtop.aspx
change
<MM:PageBind runat="server" PostBackBind="true" />
<%
Session("topbar") = "os"
Session("bottombar") = "userinfo"
Session("bottomsubbar") = "logoninfo"
%>
into
<MM:PageBind runat="server" PostBackBind="true" />
<script runat="server" language="vb">
Session("topbar") = "os"
Session("bottombar") = "userinfo"
Session("bottomsubbar") = "logoninfo"
</script>