ios - I keep getting a use unresolved identifier error swift

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

var jsonDict =  try NSJSONSerialization.JSONObjectWithData(data!, options: NSJSONReadingOptions.MutableContainers)
 as! NSDictionary

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])

                    })
                    }
                }


            }
        })

can someone please help. Thank you.