Why do i get this error on a panel?

[Miguel Dias Moura]

Hi,

I an ASP.NET / VB web page with a panel:

<aspanel ID="content_<%# dsDocuments.FieldValue("id", Container) %>"
Runat="Server">
....
</asp: Panel>

I get this error:
The server tag is not well formed.

I know the problem is on the id="..." but I don't know how to fix it.

Can someone tell me what am I doing wrong?

Thanks,
Miguel