system.collections.generic.keynotfoundexception

[deepak.stoic]

when ever i try to obfuscate my assembly, following error occurs.
system.collections.generic.keynotfoundexception

on investigating i found that following style is causing the problem.

<ItemContainerTemplate x:Key="{ItemContainerTemplateKey DataType={x:Type Model:RibbonGalleryModel}}">
<Ribbon:RibbonGallery ScrollViewer.VerticalScrollBarVisibility="{Binding VerticalScrollBarVisibility}" ColumnsStretchToFill="True" Style="{StaticResource ResourceKey=ribbonGalleryStyle}" PreviewCommandParameter="{Binding RelativeSource={RelativeSource Self}, Path=HighlightedItem}" />
</ItemContainerTemplate>

Thanks
Deepak