ItemPublisher with Product(s) in razor

Hello,

I have made an Itemtype consisting of the following field types: product, dropdownlist and file. But I can't get it working in my razor template. The code i'm using is:

@using Dynamicweb.Content.Items;
@using System.Web;

@{
    var request = HttpContext.Current.Request;
    var response = HttpContext.Current.Response;
    var items = GetLoop("ItemPublisher:Items.List");
    var pageTitle = @Pageview.Page.get_Value("PageMenuText");
}

<h2>On page "@pageTitle" I see @items.Count items</h2>
@foreach (LoopItem item in items)
{
    <table>
        @foreach (LoopItem field in item.GetLoop("ItemPublisher:Item.Fields"))
        {
            <tr>
                @field.TemplateTags()
            </tr>
        }
    </table>
}

The error occurs when I insert the line "@field.TemplateTags()", so this makes debugging for me very difficult because of the failing TemplateTags.
The error I'm getting is:

Exception in template (Designs\Pentair\eCom/Product/Product.cshtml): System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.NullReferenceException: Object reference not set to an instance of an object.
   at Dynamicweb.eCommerce.Frontend.Renderer.FixPathAndQuery(String PathAndQuery, String GroupID)
   at Dynamicweb.eCommerce.Frontend.Renderer.RenderProduct(Product Product, Boolean ExtendedProperties, Template Template, Int32 loopCounter, Boolean renderRelated, String productURL, Int32 quantity, Int32 wishListID, Boolean renderPublicList, Int32 orderLineOfProductCount)
   at Dynamicweb.Content.Items.Editors.ProductEditor.RenderProducts(EditorRenderingContext context)
   at Dynamicweb.Content.Items.Editors.ProductEditor.RenderValue(EditorRenderingContext context)
   at Dynamicweb.Content.Items.Rendering.Renderer.RenderValueInternal(Object value, Type valueType, Template template, String tagName, ItemField meta, Boolean tryRenderLinkedItem, ItemEntry itemEntry)
   at Dynamicweb.Content.Items.Rendering.Renderer.RenderItemField(ItemField field, Object value, Dictionary`2 validationErrors, Boolean allowEditing, Template template, String tagPrefix, ItemEntry itemEntry)
   at Dynamicweb.Content.Items.Rendering.Renderer.RenderItem(ItemEntry item, ItemSettings settings)
   at Dynamicweb.Content.Items.Rendering.Renderer.RenderItems(IEnumerable`1 items, ItemListSettings settings)
   at Dynamicweb.Modules.ItemPublisher.Frontend.List()
   at Dynamicweb.Modules.ItemPublisher.Frontend.GetContent()
   --- End of inner exception stack trace ---
   at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor)
   at System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal(Object obj, Object[] parameters, Object[] arguments)
   at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
   at Dynamicweb.Extensibility.AddInManager.InvokeFunction(Object instance, String FunctionName, Object[] Params)
   at Dynamicweb.Rendering.RazorTemplateBase`1.RenderItemList(Object settings)
   at CompiledRazorTemplates.Dynamic.eccbbbee.Execute()
   at RazorEngine.Templating.TemplateBase.RazorEngine.Templating.ITemplate.Run(ExecuteContext context)
   at RazorEngine.Razor.Parse[T](String razorTemplate, T model, String cacheName)
   at Dynamicweb.Rendering.Template.Output()

What I want is to list / loop throug the item fields and working templatetags would be very welcome. Can somebody help me out?

Greetings Harald

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ItemPublisher with Product(s) in razor

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