It is unable to find the Resource file. Give a proper path there. A typical resource dictionary path will look as below:
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="/ASSEMBLY_NAME;component/FILENAME.xaml"/>
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
Note: Change the name of the ASSEMBLY_NAME in the above code. Also change the FILENAME. If it is in a different sub directory, say "Themes", it will look as below:
<ResourceDictionary Source="/ASSEMBLY_NAME;component/Themes/FILENAME.xaml"/>
Hope this will answer your query. Mark as Answer, if this helps.
Regards - Kunal Chowdhury | Microsoft MVP (Silverlight) | CodeProject MVP | Software Engineer
New Articles on Silverlight 5 Beta: Debugging Data Bindings in XAML | Working with Multiple Click (ClickCount)
Appreciate your Vote and Feedback