Issue with Log in to Parse.com using Facebook credentials - ios

Question

I created a Facebook account, set up Parse.com app and developed iOS application as suggested by Parse.com website. I followed all the steps to make changes in info.plist file and in app delegate class.
Below is my code and I tried to debug it line by line. I noticed that FB asks for user permission and even after accepting it, no further action takes place.
- (IBAction)fblogin:(FBSDKLoginButton *)sender {
NSArray *permissions = #[#"public_profile", #"email"];
[PFFacebookUtils logInInBackgroundWithReadPermissions:permissions block:^(PFUser *user, NSError *error) {
if (error) {
UIAlertView *alertVeiw = [[UIAlertView alloc] initWithTitle:#"Sorry" message:[error.userInfo objectForKey:#"error"] delegate:nil cancelButtonTitle:#"Ok" otherButtonTitles:nil];
[alertVeiw show];
} else {
[self loadData];
[self.navigationController popToRootViewControllerAnimated:NO];
}
}];
}
-(void)loadData{
FBSDKGraphRequest *request = [[FBSDKGraphRequest alloc] initWithGraphPath:#"me" parameters:#{#"fields": #"email, public_profile"}];
[request startWithCompletionHandler:^(FBSDKGraphRequestConnection *connection, id result, NSError *error)
{
if (!error)
{
// NSDictionary *userData = (NSDictionary *)result;
// NSString *first = [result objectForKey:#"first_name"];
// NSString *last = [result objectForKey:#"last_name"];
// NSString *username = [NSString stringWithFormat:#"%#.%#", first, last];
NSString *name = [result objectForKey:#"name"];
NSString *email = [result objectForKey:#"email"];
PFUser *userFb = [PFUser currentUser];
[userFb setObject:name forKey:#"username"];
[userFb setObject:email forKey:#"email"];
[userFb saveInBackgroundWithBlock:^(BOOL succeeded, NSError *error) {
if (error)
{
UIAlertView *alertVeiw = [[UIAlertView alloc] initWithTitle:#"Sorry" message:[error.userInfo objectForKey:#"error"] delegate:nil cancelButtonTitle:nil otherButtonTitles:nil];
[alertVeiw show];
} else {
[[PFInstallation currentInstallation] setObject:[PFUser currentUser].objectId forKey:#"userId"];
[[PFInstallation currentInstallation] saveInBackground];
// [self.navigationController popToRootViewControllerAnimated:NO];
}
}];
}
}];
}
I couldn't understand why is it not working.
Imported frameworks into .m
#import "LoginViewController.h"
#import <Parse/Parse.h>
#import <FBSDKCoreKit/FBSDKCoreKit.h>
#import <FBSDKLoginKit/FBSDKLoginKit.h>
#import <TwitterKit/TwitterKit.h>
#import <ParseFacebookUtilsV4/PFFacebookUtils.h>
#import "InboxViewController.h"
#import "MBProgressHUD.h"
above is the only login code i have and im not sure why its not working. When i first added and changed the code it would log in and provide a random username. Then when i kept trying different methods and finally ended up with method above it stopped logging in