Hi, I'm not a coder, I'm a designer - I copy and paste code in from other sites and then try and tweak to make it work!

And I can't get the related links bit to work.

I have a partial which is linked to from the homepage of the site: -

@{
        IEnumerable<IPublishedContent> adverts = Model.Content.GetPropertyValue<IEnumerable<IPublishedContent>>("advertLinks");
        @Html.Partial("PRSP/PRSP-NestedContent/PRSP-AdvertLinks", adverts);
    }

and I have a partial which is: -

@using Umbraco.Web.Models;

@inherits Umbraco.Web.Mvc.UmbracoViewPage<IEnumerable<IPublishedContent>>

    <div class="row add-lg-marg-tb">

        @{
            foreach (IPublishedContent advert in Model.Where(x => x.IsVisible()))

            {
                string advertTitle = advert.GetPropertyValue<string>("title");
                string advertDesc = advert.GetPropertyValue<string>("description");
                string imageUrl = advert.HasValue("image") ? advert.GetPropertyValue<IPublishedContent>("image").Url : "media/1016/advert-crimestoppers-newlogo.jpg";
                string altText = "Descriptive image";

                //look for the type RelatedLink within imageLinks and refer to them as links
                IEnumerable<RelatedLink> links = advert.GetPropertyValue<IEnumerable<RelatedLink>>("imageLink");
                //if RelatedLink has a reference link and is not empty, if is empty leave blank (return null)
                RelatedLink link = links != null ? links.FirstOrDefault() : null;

                 <div class="col-xs-12 col-sm-6 col-md-6 col-lg-4 add-lg-marg-b">
                     <div class="card">
                        <img class="card-img-top" src="@imageUrl" alt="@altText" data-holder-rendered="true">
                        <div class="card-body">
                            <h3 class="card-title">@advertTitle</h3>
                            <p>@advertDesc</p>
                            <p><a class="btn btn-primary btn-lg head-button noIcon-only" role="button" target="@(link.NewWindow ? "_self" : null)" href="@link.Link" href="#">@link.Caption</a></p>
                        </div>
                    </div>  
                </div>
            }
        }
    </div>

The error I get is this:

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

And the stack line reference is:

<p>@advertDesc</p>

When I comment out the p tag where I would like the link to appear all is displayed as it should be apart form the link that I commented out.

I really don't understand. When I comment out all code apart from the link code it returns an error:

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

and it complains about:

RelatedLink link = links != null ? links.FirstOrDefault() : null;

And if I comment that line out as I think it just checks to make sure there is a link the error message I get is related to the p tag and it says 'link' does not exist.

I've used the same code on a Carousal from this tutorial (thank you brillaint :)) and it worked fine in that.

sorry for the long post but I find it very helpful for all references shown when I read other's posts.

Thank you for taking a look - learning something new every day.