What I'm trying to do is return the URL of a contentpicker inside a media item. I've searched through the forum and seem to be using the various answers that are posted but getting an error...confused! I assume using umbraco.library.NiceUrl would work but no dice. Here's my script below if anyone point out what I'm doing wrong

@using DigibizAdvancedMediaPicker
@using umbraco.MacroEngines   
@using umbraco.cms.businesslogic.member;     
@using umbraco.cms.businesslogic.media;                                             
@inherits umbraco.MacroEngines.DynamicNodeContext                                          
@{


    var promoBlocks = @Model.AncestorOrSelf(1).DescendantsOrSelf("HomepagePromoBlock");

    @*promoBlocks.Count()*@

    foreach (var promo in promoBlocks)
    {    
        if (promo.HasAccess())
        {
            @*<p>@promo.Name</p>*@

            if (promo.hotspots != null)
            {
                var mediaIds = promo.hotspots.Split(',');

                foreach (string mId in mediaIds)
                {
                    dynamic mediaItem = new DynamicMedia(Int32.Parse(mId));
                    dynamic hotspotImage = new DynamicMedia(Int32.Parse(@mediaItem.hotspotImage));

                    <a href="@umbraco.library.NiceUrl(mediaItem.hotspotLink)" title="@mediaItem.Name"><img src="@hotspotImage.umbracoFile" alt="image" /></a>
                }
            }
            return;
        }
    }
}