Ok, I took the form tag out in the master page, this has no form now. This is the page I'm requesting which will not load because of the error.
<pre lang="xml"><asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
<asp:Label CssClass="CatalogTitle" ID="titleLabel" runat="server" Text=""></asp:Label><br />
<asp:Label CssClass="CatalogDescription" ID="descriptionLabel" runat="server" Text=""></asp:Label><br />
<br />
<uc1:ProductsList ID="ProductsList1" runat="server" />
</asp:Content>