Consider the following code:

@{

    var pageSize = 1;

    var page = 1; int.TryParse(Request.QueryString["page"], out page);

    var items = Umbraco.TypedContent(Model.Content.Id).Children.Where(x => x.DocumentTypeAlias == "PortfolioItem" && x.IsVisible());

    var totalPages = (int)Math.Ceiling((double)items.Count() / (double)pageSize);

    if (page > totalPages)

    {

        page = totalPages;

    }

    else if (page < 1)

    {

        page = 1;

    }

}

@foreach (var item in items.Skip((page - 1) * pageSize).Take(pageSize).OrderBy(x => x.Name))

{

}

I get a YSOD on the line @item.PortfolioItemCoverPhoto

Why cant I display document type attributes of my portfolio items? (There are currently two portfolio items with various attributes of PotfolioItem*****").

Thanks for any input. 

Kind regards.