Error executing template "Designs/DS2016/Paragraph/FrontpageSubjects.cshtml"
System.ArgumentNullException: Value cannot be null.
Parameter name: source
   at System.Linq.Enumerable.Any[TSource](IEnumerable`1 source)
   at CompiledRazorTemplates.Dynamic.RazorEngine_ea783250dd3e47a2b24fb8a70fabf51d.Execute() in C:\home\site\wwwroot\Files\Templates\Designs\DS2016\Paragraph\FrontpageSubjects.cshtml:line 15
   at RazorEngine.Templating.TemplateBase.RazorEngine.Templating.ITemplate.Run(ExecuteContext context, TextWriter reader)
   at RazorEngine.Templating.RazorEngineCore.RunTemplate(ICompiledTemplate template, TextWriter writer, Object model, DynamicViewBag viewBag)
   at RazorEngine.Templating.RazorEngineService.RunCompile(ITemplateKey key, TextWriter writer, Type modelType, Object model, DynamicViewBag viewBag)
   at RazorEngine.Templating.DynamicWrapperService.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 RazorEngine.Templating.RazorEngineServiceExtensions.RunCompile(IRazorEngineService service, String name, Type modelType, Object model, DynamicViewBag viewBag)
   at Dynamicweb.Rendering.RazorTemplateRenderingProvider.Render(Template template)
   at Dynamicweb.Rendering.TemplateRenderingService.Render(Template template)
   at Dynamicweb.Rendering.Template.RenderRazorTemplate()


  1     @inherits Dynamicweb.Rendering.RazorTemplateBase<Dynamicweb.Rendering.RazorTemplateModel<Dynamicweb.Rendering.Template>>
  2     @using Dynamicweb.Core;
  3     @using Dynamicweb.Ecommerce.Products;
  4     
  5     @{
  6         var productPageLink = GetString("Item.ProductCatalogLink");
  7         var categoryLoop = global::Dynamicweb.Ecommerce.Products.Group.GetGroupById("CATEGORY");
  8         GroupCollection subGroupsLoop = default(GroupCollection);
  9         if (categoryLoop != null)
 10         {
 11             subGroupsLoop = categoryLoop.Subgroups;
 12         }
 13     }
 14     
 15     @if (subGroupsLoop.Any()) {
 16         <div class="js-flexslider-subjects flex-subjects-container master-slider-parent ms-partialview-template">
 17           <div class="master-slider ms-skin-light-4" id="js-master-slider-@GetValue("ParagraphID")">
 18             @foreach(var g in subGroupsLoop.Where(g => g.NavigationShowInMenu))
 19             {
 20                var groupLink = productPageLink + "&GroupID=" + g.IdUrlEncoded;
 21                var imageLink = !string.IsNullOrWhiteSpace(g.LargeImage.ToString()) ? "Files/" + g.LargeImage : "https://placehold.it/660x440";
 22                 //20160930: new custom name
 23       		    var customName = Converter.ToString(g.ProductGroupFieldValues.GetProductGroupFieldValue("CustomName").Value);
 24       		    var name = string.IsNullOrEmpty(customName) ? g.Name : customName;
 25     
 26                <div class="subject-element ms-slide" data-fill-mode="fill" data-delay="3">
 27     
 28                   <div class="subject-top-container text-center ms-layer ms-caption" data-type="text" data-position="static">
 29                     <h3 class="subject-title">
 30                       <a href="@groupLink">@name</a>
 31                     </h3>
 32                     <div class="subject-description">
 33                       @g.Description
 34                     </div>
 35                   </div>
 36                   <img src="@imageLink" data-src="@imageLink" data-duration="800" />
 37     					    <a href="@groupLink">@name</a>
 38                </div>
 39            }
 40           </div>
 41         </div>
 42     
 43         @SnippetStart("StyleSheet")
 44         <link rel='stylesheet' id='ms-main-css'  href='@GetString("Template:DesignBaseUrl")/assets/plugins/master-slider/slider.css' type='text/css' media='all' />
 45         @SnippetEnd("StyleSheet")
 46     
 47          @SnippetStart("JavaScript")
 48         <script src='@GetString("Template:DesignBaseUrl")/assets/plugins/master-slider/slider.js?v1.3'></script>
 49         <script>
 50               $(window).load(function() {
 51     
 52     			    var mastersliderFront = new MasterSlider();
 53     
 54     			    // slider controls
 55     			    mastersliderFront.control('arrows'     ,{ autohide:true, overVideo:true  });
 56     			    // slider setup
 57     			    mastersliderFront.setup('js-master-slider-@GetValue("ParagraphID")', {
 58     				    width           : 440,
 59     				    height          : 293,
 60     				    minHeight       : 0,
 61     				    space           : 10,
 62     				    grabCursor      : true,
 63     				    swipe           : true,
 64     				    mouse           : true,
 65     				    keyboard        : false,
 66     				    layout          : "partialview",
 67     				    wheel           : false,
 68     				    autoplay        : true,
 69     				    instantStartLayers:false,
 70     				    loop            : true,
 71     				    shuffle         : false,
 72     				    preload         : 0,
 73     				    heightLimit     : true,
 74     				    autoHeight      : false,
 75     				    smoothHeight    : true,
 76     				    endPause        : false,
 77     				    overPause       : true,
 78     				    fillMode        : "fill",
 79     				    centerControls  : true,
 80     				    startOnAppear   : false,
 81     				    layersMode      : "center",
 82     				    autofillTarget  : "",
 83     				    hideLayers      : false,
 84     				    fullscreenMargin: 0,
 85     				    speed           : 20,
 86     				    dir             : "h",
 87     				    parallaxMode    : 'swipe',
 88     				    view            : "fadeBasic"
 89     			    });
 90     
 91     
 92     			    window.masterslider_instances = window.masterslider_instances || [];
 93     			    window.masterslider_instances.push( mastersliderFront );
 94     		    });
 95     
 96         </script>
 97         @SnippetEnd("JavaScript")
 98     }