System.InvalidOperationException: Collection was modified; enumeration operation may not execute. at System.Collections.ArrayList.ArrayListEnumeratorSimple.MoveNext() at System.Linq.Enumerable.d__b1`1.MoveNext() at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection) at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source) at NNF.Web.Infrastructure.Lucene.LuceneNode.get_ChildrenAsList() in c:\buildAgent\work\276d26d2163e5807\NNF.Web\Infrastructure\Lucene\LuceneNode.cs:line 384 at umbraco.NodeExtensions.d__31.MoveNext() at umbraco.NodeExtensions.d__31.MoveNext() at umbraco.NodeExtensions.d__31.MoveNext() at umbraco.NodeExtensions.d__31.MoveNext() at System.Linq.Enumerable.WhereEnumerableIterator`1.MoveNext() at System.Linq.Enumerable.FirstOrDefault[TSource](IEnumerable`1 source) at ASP._Page_Templates_Partials__Footer_cshtml.Execute() in c:\Octopus\Applications\NNF\NNF.Web.Prod\1.0.1.42\Templates\Partials\_Footer.cshtml:line 19 at System.Web.WebPages.WebPageBase.ExecutePageHierarchy() at System.Web.WebPages.WebPage.ExecutePageHierarchy() at System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage) at ASP._Page_Templates_Layout__Layout_cshtml.Execute() in c:\Octopus\Applications\NNF\NNF.Web.Prod\1.0.1.42\Templates\Layout\_Layout.cshtml:line 187 at System.Web.WebPages.WebPageBase.ExecutePageHierarchy() at System.Web.WebPages.WebPage.ExecutePageHierarchy() at System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage) at System.Web.WebPages.WebPageBase.RenderSurrounding(String partialViewName, Action`1 body) at System.Web.WebPages.WebPageBase.PopContext() at System.Web.WebPages.WebPageBase.RenderSurrounding(String partialViewName, Action`1 body) at System.Web.WebPages.WebPageBase.PopContext() at Eksponent.RazorRocks.RazorTemplateAction`1.<>c__DisplayClass4.b__1(TextWriter w) in c:\Data\Projekter\Eksponent.RazorRocks\Eksponent.RazorRocks\Eksponent.RazorRocks\RazorTemplateAction.cs:line 74 at Eksponent.RazorRocks.TemplateMatcher`1.<>c__DisplayClass9.b__7(TextWriter w) in c:\Data\Projekter\Eksponent.RazorRocks\Eksponent.RazorRocks\Eksponent.RazorRocks\TemplateMatcher.cs:line 144 at ASP._Page_templates_dispatch_cshtml.Execute() in c:\Octopus\Applications\NNF\NNF.Web.Prod\1.0.1.42\Templates\Dispatch.cshtml:line 58