I'm following this tutorial to integrate facebook login with messenger. When I'm compiling the first part of the code, I receive the error:
Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'You must initialize PFFacebookUtils with a call to +initializeFacebookWithApplicationLaunchOptions'
I came across multiple threads including this one, however this was fixed in the new version I'm using already and thus can't be applied to fix my problem.
I hooked up a button that runs the tutorial code:
- (IBAction)loginWithFacebook:(id)sender
{
    // Set permissions required from the facebook user account
    NSArray *permissionsArray = @[ @"user_about_me", @"user_relationships", @"user_birthday", @"user_location"];
    // Login PFUser using Facebook
    [PFFacebookUtils logInInBackgroundWithReadPermissions:permissionsArray block:^(PFUser *user, NSError *error)
    {
        if (!user)
        {
            NSLog(@"Uh oh. The user cancelled the Facebook login.");
        }
        else if (user.isNew)
        {
            NSLog(@"User signed up and logged in through Facebook!");
        }
        else
        {
            NSLog(@"User logged in through Facebook!");
        }
    }];
}
Also, my AppDelegate.m has:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Override point for customization after application launch.
    [[FBSDKApplicationDelegate sharedInstance] application:application didFinishLaunchingWithOptions:launchOptions];
    return YES;
}