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Error executing template "Designs/Swift/Navigation/Nav_Sidenavigation_Custom.cshtml"
System.NullReferenceException: Object reference not set to an instance of an object.
   at CompiledRazorTemplates.Dynamic.RazorEngine_88ba3d83ab864892924340c43d5eecb2.Execute() in C:\inetpub\solutions\Goecker-2022-Prod\Files\Templates\Designs\Swift\Navigation\Nav_Sidenavigation_Custom.cshtml:line 18
   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     @inherits Dynamicweb.Rendering.ViewModelTemplate<Dynamicweb.Frontend.Navigation.NavigationTreeViewModel>
  2     @using Dynamicweb.Core
  3     
  4     @* CUSTOM TEMPLATE *@
  5     
  6     @if (Model.Nodes.Any())
  7     {
  8         var theme = Model.Parameters.ContainsKey("Theme") ? Model.Parameters["Theme"].ToString().ToLower() : string.Empty;
  9         var rootPageId = Model.Parameters.ContainsKey("RootpageId") ? Model.Parameters["RootpageId"].ToString().ToLower() : string.Empty;
 10         bool mobileOrTablet = Pageview.Device == Dynamicweb.Frontend.Devices.DeviceType.Mobile || Pageview.Device == Dynamicweb.Frontend.Devices.DeviceType.Tablet;
 11         var guid = Guid.NewGuid();
 12     
 13         <button class="btn btn-secondary mb-3 @(mobileOrTablet ? "" : "hidden")" data-bs-toggle="collapse" data-bs-target="#sidenav-@guid">@Translate("Menu")</button>
 14     
 15         <div class="sidenav border-1 d-flex flex-column @theme @(mobileOrTablet ? "collapse" : "")" id="sidenav-@guid">
 16             @if (!string.IsNullOrWhiteSpace(rootPageId))
 17             {
 18                 var rootPage = Dynamicweb.Services.Pages.GetPage(Converter.ToInt32(rootPageId));
 19     
 20                 <a class="sidenav-link border-1 border-bottom border-top py-2 ps-1 text-decoration-none link-primary fw-bold" href="/Default.aspx?ID=@rootPage.ID">@rootPage.GetDisplayName()</a>
 21     
 22                 if (Model.Nodes.Any())
 23                 {
 24                     <div class="subnav d-flex flex-column">
 25                         @foreach (var node in Model.Nodes)
 26                         {
 27                             @RenderNavigationLink(node)
 28                         }
 29                     </div>
 30                 }
 31             }
 32         </div>
 33     }
 34     
 35     @helper RenderNavigationLink(Dynamicweb.Frontend.Navigation.NavigationTreeNodeViewModel node)
 36     {
 37         var paddingStart = node.Level + 1;
 38     
 39         <a class="sidenav-link border-1 border-bottom py-2 ps-@paddingStart @(node.IsActive ? "bg-light" : "") text-decoration-none link-primary" href="/Default.aspx?ID=@node.PageId">@node.Name</a>
 40     
 41         if (node.Nodes.Any())
 42         {
 43             <div class="subnav d-flex flex-column">
 44                 @foreach (var childNode in node.Nodes)
 45                 {
 46                     @RenderNavigationLink(childNode)
 47                 }
 48             </div>
 49         }
 50     }