title: Required attribute 'duplicateFilePattern' not found
body: <p>I'm using elFinder Webfroms version from <a href="https://elfinder.codeplex.com/" rel="nofollow noreferrer">https://elfinder.codeplex.com/</a>. I've downloaded and tried to run the project but unable to run the project. I'm getting following error while running the test project.</p>
  
  <blockquote>
    <p>Server Error in '/' Application.</p>
    
    <p>Configuration Error</p>
    
    <p>Description: An error occurred during the processing of a
    configuration file required to service this request. Please review the
    specific error details below and modify your configuration file
    appropriately. </p>
    
    <p>Parser Error Message: Required attribute 'duplicateFilePattern' not
    found.</p>
    
    <p>Source Error: </p>
    
    <p>Line 12:    Line 13:  Line 14:   
    defaultVolumeName="LocalFileSystem"
    baseUrl="http://localhost:56439/data/"
    baseThumbsUrl="http://localhost:56439/data/.thumbs/"> Line 16:<br>
    </p>
    
    <p>Source File:
    C:\Users\xyz\Desktop\elFinderFileManager\elFinderFileManager\web.config
    Line: 14 </p>
    
    <p>Version Information: Microsoft .NET Framework Version:4.0.30319;
    ASP.NET Version:4.0.30319.34248</p>
  </blockquote>
  
  <p>Error:
  <img src="https://i.imgur.com/IvPXJje.png" alt="Image"></p>
  
  <p>I've tried a lot to find on Google to find out the reason for this error but was not able to find any single clue on the web.</p>
  
  <p>Please anyone know about it, let me know how can I resolve this issue?</p>
  
  <p>Thanks in advance!</p>