为什么我不能在Silverlight中移动资源字典？

<Application.resources>
    <resourceDictionary>
        <resourceDictionary.MergedDictionaries>
            <resourceDictionary source="/PPCa.Common.Infrastructure;component/Skins/Default.xaml"/>
            <resourceDictionary>
                <app:resourceWrapper x:Key="resourceWrapper" />
                <app:NotOperatorValueConverter x:Key="NotOperatorValueConverter" />
            </resourceDictionary>
        </resourceDictionary.MergedDictionaries>
    </resourceDictionary>                
</Application.resources>

这是一个例外：

System.Windows.Markup.XamlParseException occurred
  message=Failed to assign to property 'System.Windows.resourceDictionary.source'. [Line: 11 Position: 44]
  Linenumber=11
  LinePosition=44
  StackTrace:
       at System.Windows.Application.LoadComponent(Object component,Uri resourceLocator)
  InnerException:

第11行是这样的：

<resourceDictionary source="/PPCa.Common.Infrastructure;component/Skins/Default.xaml"/>

我错误地合并了我的词典吗？