ResourceDictionary Warning

[nevrotkampot]

Hello! I have included two resourcedictionary in my project:

<ResourceDictionary.MergedDictionaries>
               < ResourceDictionary Source="/FirstFloor.ModernUI;component/Assets/ModernUI.xaml" />
               < ResourceDictionary Source="/FirstFloor.ModernUI;component/Assets/ModernUI.Light.xaml"/>
            </ResourceDictionary.MergedDictionaries>

But when my project is running, in output window i see too many repeatable errors:
System.Windows.ResourceDictionary Warning: 9 : Resource not found; ResourceKey='ScrollBarBackground'
System.Windows.ResourceDictionary Warning: 9 : Resource not found; ResourceKey='ItemText'