title: I keep getting a use unresolved identifier error swift
body: <p>When I try to run this project I am greeted with a "Use of unresolved identifier error." Here is the code I get the error on the line with </p>
  
  <pre>
  var jsonDict =  try NSJSONSerialization.JSONObjectWithData(data!, options: NSJSONReadingOptions.MutableContainers)
   as! NSDictionary</pre>
  
  <pre>
  let task : NSURLSessionDataTask = session.dataTaskWithRequest(request, completionHandler: {data, response, error -> Void in
  
              if((error) != nil) {
                  print(error!.localizedDescription)
              } else {
  
                  let err: NSError?
                  do {
                  var jsonDict =  try NSJSONSerialization.JSONObjectWithData(data!, options: NSJSONReadingOptions.MutableContainers) as! NSDictionary
                  } catch {
                  if(err != nil) {
                      print("JSON Error \(err!.localizedDescription)")
                  }
  
                  else {
                      //5: Extract the Quotes and Values and send them inside a NSNotification
                      let quotes:NSArray = ((jsonDict.objectForKey("query") as! NSDictionary).objectForKey("results") as! NSDictionary).objectForKey("quote") as! NSArray
                      dispatch_async(dispatch_get_main_queue(), {
                          NSNotificationCenter.defaultCenter().postNotificationName(kNotificationStocksUpdated, object: nil, userInfo: [kNotificationStocksUpdated:quotes])
  
                      })
                      }
                  }
  
              }
          })
  
  </pre>
  
  <p>can someone please help. Thank you.</p>