Get json from Twitter API in iPhone using JSON Framework

Question

Hello now I'm trying to get json data from Twitter API using iPhone. I'm using JSON Framework. This code has good results.

#import "JSON/JSON.h"
NSString *urlString= @"http://api.twitter.com/1/statuses/public_timeline.json";
NSURL *url = [NSURL URLWithString:urlString];
NSString *jsonString = [NSString stringWithContentsOfURL:url encoding:NSUTF8StringEncoding error:nil];
NSLog(@"%@", jsonString);

But when I change API's URL like "http://search.twitter.com/trends/current.json" the above code gets SIGABRT error.

Could someone explain it to me?

Thanks.