TFS 2015 RC Error TF400898: An Internal Error Occurred

This error occurs when I try to open Unit tests results. This is under "BUILD.PREVIEW" web portal's menu item. The link is http://<myserver>:8080/tfs/DefaultCollection/bender-tfs/_testManagement/runs#runId=16&_a=resultQuery.

Error details from the Event log:

<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event"><System><Provider Name="TFS Services" /><EventID Qualifiers="0">3000</EventID><Level>2</Level><Task>0</Task><Keywords>0x80000000000000</Keywords><TimeCreated SystemTime="2015-08-13T09:58:01.000000000Z" /><EventRecordID>2106</EventRecordID><Channel>Application</Channel><Computer>vl-win10</Computer><Security /></System><EventData><Data>TF53010: The following error has occurred in a Team Foundation component or extension:
Date (UTC): 8/13/2015 9:58:01 AM
Machine: VL-WIN10
Application Domain: /LM/W3SVC/2/ROOT/tfs-4-130837780097887508
Assembly: Microsoft.TeamFoundation.Framework.Server, Version=14.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a; v4.0.30319
Service Host: c19f4687-c269-49f1-bb20-c7717ff4dc45 (DefaultCollection)
Process Details:
  Process Name: w3wp
  Process Id: 2440
  Thread Id: 7396
  Account name: VL-WIN10\v

Detailed Message: TF30065: An unhandled exception occurred.

Web Request Details
    Url: http://vl-win10:8080/tfs/DefaultCollection/bender-tfs/_testManagement/runs [method: GET]
    User Agent: Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/44.0.2403.130 Safari/537.36
    Headers: not available
    Path: /tfs/DefaultCollection/bender-tfs/_testManagement/runs
    Local Request: False
    Host Address: 10.8.11.89
    User: VL-WIN10\v [authentication type: NTLM]

Exception Message: Object reference not set to an instance of an object. (type NullReferenceException)
Exception Stack Trace:    at ASP._areas_testmanagement_views_testmanagement_error_aspx.__RenderContent4(HtmlTextWriter __w, Control parameterContainer)
   at System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children)
   at System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter)
   at System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children)
   at System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter)
   at ASP._views_shared_masters_hubpage_master.__Render__control6(HtmlTextWriter __w, Control parameterContainer)
   at System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children)
   at System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter)
   at ASP._views_shared_main_master.__Render__control1(HtmlTextWriter __w, Control parameterContainer)
   at System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children)
   at System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter)
   at System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children)
   at System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter)
   at System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children)
   at System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter)
   at System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children)
   at System.Web.Mvc.ViewPage.Render(HtmlTextWriter writer)
   at Microsoft.TeamFoundation.Server.WebAccess.TfsViewPage`1.Render(HtmlTextWriter writer)
   at System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter)
   at Microsoft.TeamFoundation.Server.WebAccess.TfsViewPage`1.RenderControl(HtmlTextWriter writer)
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

</Data></EventData></Event>

Any thoughts?