title: Convert NSDictionary to NSMutableArray
body: <p>I have this code: </p>
  
  <pre><code>NSDictionary *jsonGuardado = [self dictionaryFromJson:JSON];
  NSLog(@"HOLA %@",jsonGuardado);
  NSMutableArray *arrayCodigos = [jsonGuardado objectForKey:@"code"];
  codigos = arrayCodigos;
  </code></pre>
  
  <p>(Codigos is an NSMutableArray)</p>
  
  <p>The NSLOG return this:</p>
  
  <pre><code>HOLA (
          {
          code = 22051310;
      },
          {
          code = 22051311;
      },
          {
          code = 22051312;
      },
          {
          code = 22051313;
      }
  )
  </code></pre>
  
  <p>But right after this, a message error says:</p>
  
  <p><code>-[JKArray objectForKey:]: unrecognized selector sent to instance</code></p>
  
  <p>I search this error in Google and here and all the questions I found not help me.</p>
  
  <p>I'm using the <code>JSONKit</code> for make the dictionaryFromJson method.</p>