Facebook Completion Handler returning null?

I am using the Facebook API and I am using the FBRequestConnection.startForMeWithCompletionHandler method to get a user's profile picture. This was working fine for me until recently where suddenly my application constantly fails because the id parameter returns null. I looked up the documentation and it shows the following as the parameters: [FBRequestConnection startForMeWithCompletionHandler:^(FBRequestConnection *connection, id result, NSError *error)

This is my code so far:

    FBRequestConnection.startForMeWithCompletionHandler { (connection, user, error) -> Void in
        //Get individual's profile picture
        let url = NSURL(string: "http://ift.tt/1GaqSEG")
        let urlRequest = NSURLRequest(URL: url!)
        //Asynchronous request to display image
        NSURLConnection.sendAsynchronousRequest(urlRequest, queue: NSOperationQueue.mainQueue()) { (response:NSURLResponse!, data:NSData!, error:NSError!) -> Void in

            // Display the image
            let image = UIImage(data: data)
            if(image != nil){
                completion(result: true, image: self.profilePic.image)
            }
        }

    } 

Oddly enough, the user parameter in the function always returns nil and I'm not sure why. I have looked at multiple links on stack overflow and most say that either my session is inactive or I am logged out, but I have tested both and my session is indeed active. Moreover, I looked in my errors array and I got a HTTP 200 Status Code meaning that my connection works. I get two other errors, com.facebook.sdk:ErrorInnerErrorKey and com.facebook.sdk:ErrorSessionKey but upon looking into these errors, I can't find anything about them. Any help would be appreciated. Thanks!