I have some problem on my blog page with regards to paging.. it seems that I can't use my own property "blogSubheader"

var pageSize = 5;

if (Model.Content.HasValue("numberOfItemsPerPge"))
{
    pageSize = Model.Content.GetPropertyValue<int>("numberOfItemsPerPage");
}

var page = 1; int.TryParse(Request.QueryString["page"], out page);
var items = Model.Content.Children().Where(x => x.IsDocumentType("BlogPost")).OrderByDescending(x => x.CreateDate);
var totalPages = (int)Math.Ceiling((double)items.Count() / (double)pageSize);

if (page > totalPages)
{
    page = totalPages;
}
else if (page < 1)
{
    page = 1;
}

this is what i loop out in my foreach:

            @foreach (var blogPost in items.Skip((page - 1) * pageSize).Take(pageSize).OrderBy(x => x.CreateDate))
            {
                 <!--Article-->
                <article class="post-preview">
                    <a href="@blogPost.Url">
                        <h2 class="post-title">@blogPost.Name</h2>
                        <h3 class="post-subtitle">@blogPost.blogSubheader</h3>
                    </a>
                    <p class="post-meta">
                        Posted by
                        <a href="@blogPost.Url">@Model.Content.CreatorName</a>

                        on @DateTime.Today.ToString("MMMM d, yyyy")
                    </p>
                </article>
                <hr />
            }

When I type "blogSubheader" it shows it as an error... And on my blogPost documentype I have the property.

Hope my question was understandable - thanks in advance!