Commented Unassigned: 'Initialization of 'Xceed.Wpf.Toolkit.RangeSlider' threw an exception in VS2015 CTP6 [21739]

Since installation of Visual Studion 2015 CTP6 RangeSlider gives as runtime error:

{"'Initialization of 'Xceed.Wpf.Toolkit.RangeSlider' threw an exception.' Line number '87' and line position '189'."}

{pack://application:,,,/Coolblue.Purchasing.CompetitorPricing;component/views/elasticitysettingsview.xaml}

{"Initialization of 'Xceed.Wpf.Toolkit.Core.VersionResourceDictionary' threw an exception."}

{"Cannot locate resource 'xceed.wpf.toolkit;v2.3.0.0;themes/xceed.wpf.toolkit;v2.3.0.0;component/themes/aero/brushes_normalcolor.xaml'."}

This did not happen before in Visual Studio 2015 Preview.

Dit something change in VS2015 CTP6 that broke this?

Thanks in Advance for any answers,
Antoni Dol
Comments: ** Comment from web user: JeremyBake **

THANK YOU. BusyIndicator throws the same exception in VS 2015 RC Professional. This fixed it.
There should be some kind of sticky up front for this until it works out of the box.