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System.Web.HttpUnhandledException (0x80004005): An unhandled exception occurred. ---> System.InvalidOperationException: Nullable object must have a value. at System.ThrowHelper.ThrowInvalidOperationException(ExceptionResource resource) at Fortis.Model.Fields.IntegerFieldWrapper.get_Value() at ColtDC.Feature.Article.Services.ArticleFilterService.<GetYears>d__10.MoveNext() in D:\a\1\s\src\Feature\Article\code\Services\ArticleFilterService.cs:line 119 at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection) at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source) at System.Linq.Enumerable.WhereSelectListIterator`2.MoveNext() at System.Linq.Enumerable.Aggregate[TSource,TAccumulate](IEnumerable`1 source, TAccumulate seed, Func`3 func) at ColtDC.Feature.Article.Services.ArticleFilterService.GetAllArticleFilterViewModel(IArticleListing listingPage) in D:\a\1\s\src\Feature\Article\code\Services\ArticleFilterService.cs:line 162 at ColtDC.Feature.Article.Services.ArticleFilterService.GetAllBlogFiltersViewModel() in D:\a\1\s\src\Feature\Article\code\Services\ArticleFilterService.cs:line 31 at ColtDC.Feature.Article.Services.ArticleListingService.GetBlogListingViewModel(ArticleListingQuery query) in D:\a\1\s\src\Feature\Article\code\Services\ArticleListingService.cs:line 18 at lambda_method(Closure , ControllerBase , Object[] ) at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters) at System.Web.Mvc.ControllerActionInvoker.<>c__DisplayClass24_0.<InvokeActionMethodWithFilters>b__0() at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation) at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation) at System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName) at Sitecore.Mvc.Pipelines.MvcEvents.Exception.ShowAspNetErrorMessage.ShowErrorMessage(ExceptionContext exceptionContext, ExceptionArgs args) at Sitecore.Mvc.Pipelines.MvcEvents.Exception.ShowAspNetErrorMessage.Process(ExceptionArgs args) at (Object , Object ) at Sitecore.Pipelines.CorePipeline.Run(PipelineArgs args) at Sitecore.Pipelines.DefaultCorePipelineManager.Run(String pipelineName, PipelineArgs args, String pipelineDomain, Boolean failIfNotExists) at Sitecore.Pipelines.DefaultCorePipelineManager.Run(String pipelineName, PipelineArgs args, String pipelineDomain) at Sitecore.Mvc.Pipelines.PipelineService.RunPipeline[TArgs](String pipelineName, TArgs args) at Sitecore.Mvc.Filters.PipelineBasedRequestFilter.OnException(ExceptionContext exceptionContext) at System.Web.Mvc.ControllerActionInvoker.InvokeExceptionFilters(ControllerContext controllerContext, IList`1 filters, Exception exception) at System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName) at System.Web.Mvc.Controller.ExecuteCore() at System.Web.Mvc.ControllerBase.Execute(RequestContext requestContext) at Sitecore.Mvc.Controllers.ControllerRunner.ExecuteController(Controller controller) at Sitecore.Mvc.Controllers.ControllerRunner.Execute(TextWriter writer) at Sitecore.Mvc.Pipelines.Response.RenderRendering.ExecuteRenderer.Render(Renderer renderer, TextWriter writer, RenderRenderingArgs args) at ColtDC.Foundation.ErrorHandling.Pipelines.MvcRenderRendering.ErrorHandlingExecuteRenderer.Render(Renderer renderer, TextWriter writer, RenderRenderingArgs args) in D:\a\1\s\src\Foundation\ErrorHandling\code\Pipelines\MvcRenderRendering\ErrorHandlingExecuteRenderer.cs:line 36 A rendering error occurred on: BlogListing (datasource: )