umbraco.MacroEngines.DynamicNodeList does not contain a definition for [anything]

Hi guys,

I can't seem to get to the items below a level. I keep getting:

'umbraco.MacroEngines.DynamicNodeList' does not contain a definition for 'GetChildrenAsList'

'umbraco.MacroEngines.DynamicNodeList' does not contain a definition for 'Down'

'umbraco.MacroEngines.DynamicNodeList' does not contain a definition for 'Children'

'umbraco.MacroEngines.DynamicNodeList' does not contain a definition for 'Descendants'

My website is structured like:

Website

-homepage

--banners

--Categories

So when I'm on the homepage I want using Razor to loop round the banners. I've tried a loads of different ways but can't seem to get it working. Even just writing out the number of items under banners throws one of the above errors:

    dynamic banners = Model.HomepageCategories.GetChildrenAsList();
   
    @banners.Count()

Above would throw:

'umbraco.MacroEngines.DynamicNodeList' does not contain a definition for 'GetChildrenAsList'

Also stuff like this blows up:

dynamic banners = Model.Descendants("HomepageCategories").Children;

or

dynamic banners = Model.Descendants("HomepageCategories").Children();

I'm running 6.3.1, and I've install TeaCommerce but haven't done anything with it.

Thanks

Rob