Photobucket iOS API Authentication

Question

I'm trying to integrate Photobucket iOS API with my project. I requested and already have consumer key and secret. But I have a problem with authentication (may be there is will be problems with upload). Please look at my code. At first init photobucket manager:

manager = [[PhotobucketAPI alloc] initWithConsumerKey:photobucketConsumerKey
                                               consumerSecret:photobucketConsumerSecret
                                          globalErrorDelegate:self];

Then request authentication:

[manager loginDirectAndStoreForUsername:login
                                           password:pass
                                           delegate:self
                                 didSucceedSelector:@selector(didSucceedLogin:)
                                    didFailSelector:@selector(didFailLogin:)
                           downloadProgressDelegate:self
                             uploadProgressDelegate:self];

This is how look like method didFailLogin::

- (void)didFailLogin:(NSError *)error
{
    if (error)
        NSLog(@"Error: %@", error);
}

And all time I'm getting this error:

Error Domain=Authentication failed. Code=999 "The operation couldn’t be completed. (Authentication failed. error 999.)"

So what I doing wrong?