Relocated the Blog node under Home and republished the Blog node and children. (Note this is not a fresh install but an existing site). Following error occurs:

Server Error in '/' Application.
Item has already been added. Key in dictionary: 'GetSiteRoot_uBlogsySiteRoot'  Key being added: 'GetSiteRoot_uBlogsySiteRoot'
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.ArgumentException: Item has already been added. Key in dictionary: 'GetSiteRoot_uBlogsySiteRoot'  Key being added: 'GetSiteRoot_uBlogsySiteRoot'
Source Error: 
Line 11: 
Line 12:     // get title of page
Line 13:     var landing = DataService.Instance.GetSiteRoot(Model.Content) ?? DataService.Instance.GetLanding(Model.Content);
Line 14:     var title = landing.GetPropertyValue("uBlogsyContentTitle");
Line 15:     if (Model.Content.Id != landing.Id)





Source File: <*** hidden *****>\Views\Partials\uBlogsy\Global\uBlogsyGlobalSeoMeta.cshtml    Line: 13 
Stack Trace: 





[ArgumentException: Item has already been added. Key in dictionary: 'GetSiteRoot_uBlogsySiteRoot'  Key being added: 'GetSiteRoot_uBlogsySiteRoot']
   System.Collections.Hashtable.Insert(Object key, Object nvalue, Boolean add) +12646422
   uBlogsy.Common.Helpers.CacheHelper.AddToRequestCache(String key, Object value) in D:\_PROJECTS\Personal\uBlogsy\uBlogsy MVC\Source\uBlogsy.Common\Helpers\CacheHelper.cs:19
   uBlogsy.BusinessLogic.DataService.GetSiteRoot(IPublishedContent node) in D:\_PROJECTS\Personal\uBlogsy\uBlogsy MVC\Source\uBlogsy.BusinessLogic\DataService.cs:135
   ASP._Page_Views_Partials_uBlogsy_Global_uBlogsyGlobalSeoMeta_cshtml.Execute() in **HIDDEN**\Views\Partials\uBlogsy\Global\uBlogsyGlobalSeoMeta.cshtml:13
   System.Web.WebPages.WebPageBase.ExecutePageHierarchy() +280
   System.Web.Mvc.WebViewPage.ExecutePageHierarchy() +125
   System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage) +196
   System.Web.Mvc.Html.PartialExtensions.Partial(HtmlHelper htmlHelper, String partialViewName, Object model, ViewDataDictionary viewData) +147
   ASP._Page_Views__uBlogsyBaseSite_cshtml.b__0() in **HIDDEN**\Views\_uBlogsyBaseSite.cshtml:14
   System.Web.WebPages.<>c__DisplayClassb.b__9(TextWriter tw) +211
   ASP._Page_Views__uBlogsyBase_cshtml.Execute() in **HIDDEN**\Views\_uBlogsyBase.cshtml:6
   System.Web.WebPages.WebPageBase.ExecutePageHierarchy() +280
   System.Web.Mvc.WebViewPage.ExecutePageHierarchy() +125
   System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage) +196
   System.Web.WebPages.WebPageBase.RenderSurrounding(String partialViewName, Action`1 body) +208
   System.Web.WebPages.WebPageBase.PopContext() +199
   System.Web.WebPages.WebPageBase.RenderSurrounding(String partialViewName, Action`1 body) +208
   System.Web.WebPages.WebPageBase.PopContext() +199
   System.Web.WebPages.WebPageBase.RenderSurrounding(String partialViewName, Action`1 body) +208
   System.Web.WebPages.WebPageBase.PopContext() +199
   System.Web.Mvc.ViewResultBase.ExecuteResult(ControllerContext context) +380
   System.Web.Mvc.<>c__DisplayClass1a.b__17() +33
   System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilter(IResultFilter filter, ResultExecutingContext preContext, Func`1 continuation) +613
   System.Web.Mvc.ControllerActionInvoker.InvokeActionResultWithFilters(ControllerContext controllerContext, IList`1 filters, ActionResult actionResult) +263
   System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName) +691
   System.Web.Mvc.<>c__DisplayClass1d.b__19() +40
   System.Web.Mvc.Async.<>c__DisplayClass1.b__0() +20
   System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult) +53
   System.Web.Mvc.Async.<>c__DisplayClass4.b__3(IAsyncResult ar) +20
   System.Web.Mvc.<>c__DisplayClass8.b__3(IAsyncResult asyncResult) +42
   System.Web.Mvc.Async.<>c__DisplayClass4.b__3(IAsyncResult ar) +20
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +469
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +375








Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.272