'umbraco.MacroEngines.DynamicXml' does not contain a definition for 'mediaCropper'

Hi
Umbraco version 6.0.2
I have installed The Digibiz Advanced Media Picker 2.5 (DAMP 2.5)

I have tried to copy the slideshow from the Cultiv Razor sample using this code

<section id="gallery">
<div class="pics">
@if (Model.HasValue("carouselImages")) {
dynamic mediaItems = Model.CarouselImages.mediaItem;
if (mediaItems.Count() != 0)
{
foreach (var item in mediaItems)
{
var image = item.Image;
@*
If the type of the mediacropper is not XML (but a string) then there
are no crops defined, so I should not try to find the crops.
*@
var crops = image.mediaCropper;
if (crops.GetType().ToString() != "System.String")
{
<img src="@crops.Find("@name", "Homepage").url" alt="@image.nodeName" width="@image.umbracoWidth" height="@image.umbracoHeight"/><br />
}
}
}
}
</div>
<a href="#" id="prev"></a>
<a href="#" id="next"></a>
</section>

but I get this error

'umbraco.MacroEngines.DynamicXml' does not contain a definition for 'mediaCropper'

Any ideas

/Paul S