Error in Management Center after update to 8.4

Hi DW,

I just upgraded a solution to 8.4 and now i can't access Management Center.

I get this error:

[NullReferenceException: Object reference not set to an instance of an object.]
   Dynamicweb.Content.Management.Tree._Lambda$__484(ItemType k) +3
   System.Linq.EnumerableSorter`2.ComputeKeys(TElement[] elements, Int32 count) +92
   System.Linq.EnumerableSorter`1.Sort(TElement[] elements, Int32 count) +21
   System.Linq.<GetEnumerator>d__0.MoveNext() +179
   Dynamicweb.Content.Management.Tree.AddItemTypeNodes(TreeCollection trees) +380
   Dynamicweb.Content.Management.Tree.getSystemNodes() +1213
   Dynamicweb.Content.Management.Tree.GetManagementTreesBySql(String sql) +31
   Dynamicweb.Content.Management.Tree.GetManagementTrees() +11
   Dynamicweb.Admin._Default2.Page_Load(Object sender, EventArgs e) +130
   System.Web.UI.Control.OnLoad(EventArgs e) +92
   System.Web.UI.Control.LoadRecursive() +54
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +772

Is this a known issue. or should i create Support case?

// Martin

Developer forum

Error in Management Center after update to 8.4

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