The property 'Resources' is set more than once. Hatası ve Çözümü

Yanlış:

<HbysWpf:WindowBase.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="..\Resources\Chart2d\RoyaleVelvet\Chart2D.xaml"/>
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
<Button x:Key="ButtonDataSource"/>
</HbysWpf:WindowBase.Resources>

Doğru:

<HbysWpf:WindowBase.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="..\Resources\Chart2d\RoyaleVelvet\Chart2D.xaml"/>
</ResourceDictionary.MergedDictionaries>
<Button x:Key="ButtonDataSource"/>
</ResourceDictionary>
</HbysWpf:WindowBase.Resources>