"unrecognized selector" because mapping don't work about mantle HOT 3 CLOSED

_forecastOperation = nil;
    _forecastOperation = [AFJSONRequestOperation JSONRequestOperationWithRequest:forecastRequest
                                                                         success:^(NSURLRequest *request, NSHTTPURLResponse *response, id JSON) {
        // add Forecast
        if(![JSON isKindOfClass:[NSDictionary class]]) return;
        NSDictionary *forecastDict = (NSDictionary*)JSON;

        // HERE WE GO

    } failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, id JSON) {
        ...
    }];
    [_forecastOperation start];

MJUForecastModel *aForecast = [[MJUForecastModel alloc] initWithDictionary:forecastDict error:&error];