Error executing template "Designs/exhibition_site/_partials/nav-local-horizontal-a11y-optimized.cshtml"
System.ArgumentNullException: Value cannot be null.
Parameter name: source
at System.Linq.Enumerable.Where[TSource](IEnumerable`1 source, Func`2 predicate)
at Dynamicweb.Frontend.XmlNavigation.MakeXml(Int32 parentId, Int32 levelStart, Int32 levelStop, Expand expand, Int32 selectedAreaId)
at Dynamicweb.Frontend.XmlNavigation.GetNavigationHtml(Int32 parentId, Int32 levelStart, Int32 levelStop, Expand expand, String name, String xsltPath, Int32 selectedAreaId, Boolean sitemapMode, NameValueCollection settings, NameValueCollection attributes, IncludeMode mode)
at Dynamicweb.Frontend.XmlNavigation.GetNavigationHtml(NameValueCollection settings, NameValueCollection attributes)
at CompiledRazorTemplates.Dynamic.RazorEngine_df6387fef3224a2bba91a1f5e8a4bf90.Execute() in E:\Websites\mch365.espresso5.dk\Files\Templates\Designs\exhibition_site\_partials\nav-local-horizontal-a11y-optimized.cshtml:line 106
at RazorEngine.Templating.TemplateBase.RazorEngine.Templating.ITemplate.Run(ExecuteContext context, TextWriter reader)
at RazorEngine.Templating.RazorEngineService.RunCompile(ITemplateKey key, TextWriter writer, Type modelType, Object model, DynamicViewBag viewBag)
at RazorEngine.Templating.RazorEngineServiceExtensions.<>c__DisplayClass16_0.<RunCompile>b__0(TextWriter writer)
at RazorEngine.Templating.RazorEngineServiceExtensions.WithWriter(Action`1 withWriter)
at Dynamicweb.Rendering.RazorTemplateRenderingProvider.Render(Template template)
at Dynamicweb.Rendering.TemplateRenderingService.Render(Template template)
at Dynamicweb.Rendering.Template.RenderRazorTemplate()
  1     @using Dynamicweb.Frontend
  2     @inherits ViewModelTemplate< PageBaseModel >
  3     @using Co3.Espresso.Website.Models.FrontEnd.Pages
  4     @using Dynamicweb.Rendering
  5     @using System.IO
  6     @using Co3.Espresso.Website.Models.FrontEnd
  7     @using Co3.Espresso.Website.Models.FrontEnd.Settings
  8     @using Co3.Espresso.Website.Services
  9     @{
 10       int currentPageId = PageView.Current().Page.ID;
 11       int currentPageParentId = PageView.Current().Page.ParentPageId;
 12       int navigationLocalHorizontalParentPageId = 0;
 13       if ( !string.IsNullOrEmpty( Model.Item.NavigationLocalParentPage ) )
 14       {
 15         int.TryParse( Model.Item.NavigationLocalParentPage, out navigationLocalHorizontalParentPageId );
 16       }
 17       if ( navigationLocalHorizontalParentPageId == 0 )
 18       {
 19         navigationLocalHorizontalParentPageId = currentPageId;
 20         if ( !Dynamicweb.Services.Pages.GetPagesByParentID( navigationLocalHorizontalParentPageId ).Any() )
 21         {
 22           navigationLocalHorizontalParentPageId = currentPageParentId;
 23         }
 24       }
 25 26       string navigationLocalBackLinkHref = string.Empty;
 27       string navigationLocalBackLinkText = string.Empty;
 28       if ( Model.Item.NavigationLocalBackLinkShow == "True" )
 29       {
 30         if ( !string.IsNullOrEmpty( Model.Item.NavigationLocalBackLinkHref ) )
 31         {
 32           navigationLocalBackLinkHref = Model.Item.NavigationLocalBackLinkHref;
 33         }
 34         else
 35         {
 36           navigationLocalBackLinkHref = string.Format( "/Default.aspx?ID={0}", currentPageParentId != 0 ? currentPageParentId : currentPageId );
 37         }
 38         if ( !string.IsNullOrEmpty( Model.Item.NavigationLocalBackLinkText ) )
 39         {
 40           navigationLocalBackLinkText = Model.Item.NavigationLocalBackLinkText;
 41         }
 42         else
 43         {
 44           navigationLocalBackLinkText = Translate( "Navigation - Back link - Text", "Back" );
 45         }
 46       }
 47 48       string navigationLocalHorizontalClassList = "e-section e-nav-local e-nav-local-horizontal js-e-nav-local-horizontal w-100 mch365-custom-local-top-navigation";
 49       string navigationLocalHorizontalContainerClassList = "e-nav-local-container";
 50       string navigationLocalHorizontalTemplate = "local-" + Model.Item.NavigationLocalLayout + ".xslt";
 51       if ( string.IsNullOrEmpty( Model.Item.NavigationLocalTemplate ) == false && Path.GetExtension( Model.Item.NavigationLocalTemplate ) == ".xslt" )
 52       {
 53         navigationLocalHorizontalTemplate = Path.GetFileName( Model.Item.NavigationLocalTemplate );
 54       }
 55 56       if ( Model.Item.NavigationLocalShow == "True" && Model.Item.NavigationLocalLayout == "horizontal" )
 57       {
 58         navigationLocalHorizontalClassList += " " + Model.Item.NavigationLocalCustomClasses;
 59         if ( Model.Item.NavigationLocalSticky == "True" )
 60         {
 61           navigationLocalHorizontalClassList += " is-sticky";
 62         }
 63         if ( Model.Item.NavigationLocalAbsolute == "True" )
 64         {
 65           navigationLocalHorizontalClassList += " is-absolute";
 66         }
 67         else
 68         {
 69           if ( Model.Item.NavigationLocalMarginTop != "0" && Model.Item.NavigationLocalMarginTop != "" )
 70           {
 71             navigationLocalHorizontalClassList += " mt-" + Model.Item.NavigationLocalMarginTop;
 72           }
 73           if ( Model.Item.NavigationLocalMarginBottom != "0" && Model.Item.NavigationLocalMarginBottom != "" )
 74           {
 75             navigationLocalHorizontalClassList += " mb-" + Model.Item.NavigationLocalMarginBottom;
 76           }
 77         }
 78       }
 79     }
 80     @if ( Model.Item.NavigationLocalShow == "True" && Model.Item.NavigationLocalLayout == "horizontal" )
 81     {
 82       @RenderingService.Instance.SectionStart( new SectionSettings()
 83       {
 84         Classes = new ClassList( navigationLocalHorizontalClassList ),
 85         ContentClasses = new ClassList( "col-12" )
 86       } )
 87       <div class="col-12">
 88         <nav id="dwnav-local-horizontal-@navigationLocalHorizontalParentPageId" class="@navigationLocalHorizontalContainerClassList">
 89           <ul class="justify-content-start nav">
 90 91             @if ( Model.Item.NavigationLocalHeading != "" )
 92             {
 93               <li class="e-nav-local-heading">
 94                 <h2>@Model.Item.NavigationLocalHeading</h2>
 95               </li>
 96             }
 97             @if ( Model.Item.NavigationLocalBackLinkShow == "True" )
 98             {
 99               <li class="e-nav-local-back-link nav-item">
100                 <a class="arrow-left back-link" href="@navigationLocalBackLinkHref">
101                   <span class="e-nav-pagename">@navigationLocalBackLinkText</span>
102                 </a>
103               </li>
104             }
105106             @RenderNavigation( new
107             {
108               id = "dwnav-local-horizontal-" + navigationLocalHorizontalParentPageId,
109               parentid = navigationLocalHorizontalParentPageId,
110               template = navigationLocalHorizontalTemplate,
111               startlevel = Model.Item.NavigationLocalLevelStart,
112               endlevel = Model.Item.NavigationLocalLevelEnd,
113               expandmode = Model.Item.NavigationLocalPageTreeExpand == "True" ? "all" : "path"
114             } )
115           </ul>
116         </nav>
117       </div>
118       @RenderingService.Instance.SectionEnd()
119     }
120