Why it is terminating?

responseData = [[NSMutableData data] retain];
 NSString *requestString = [NSString stringWithFormat:@"http://api.yelp.com/business_review_search?term=&lat=%f&long=%f&radius=10&limit=20&ywsid=XXXXXXXXXX&category=%@",[[ListofLat objectAtIndex:i] floatValue], [[ListofLong objectAtIndex:i] floatValue],appDelegate.categoryField] ; 
//NSURL *url = [[NSURL alloc] initWithString:requestString];
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:requestString]];
/*  NSData *tempData =[[NSData alloc] initWithContentsOfURL:url];
    NSString *Str = [[NSString alloc] initWithData:tempData encoding:NSUTF8StringEncoding];
    NSLog(@"%@",Str);*/
NSURLResponse *response = nil;
NSError *error = nil;
//getting the data
NSData *newData = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];
//json parse
NSString *responseString开发者_开发技巧 = [[NSString alloc] initWithData:newData encoding:NSUTF8StringEncoding];
NSDictionary *jsonObject = [responseString JSONValue];
//Accessing JSON content
NSLog(@"message :  %@", [jsonObject objectForKey:@"message"] );
    NSArray *status = [jsonObject objectForKey:@"message"] ;
    NSLog(@"message :  %@", status );
            for(NSDictionary *response in status)
                    {
                        NSString *Resptxt =[response objectForKey:@"text"];
                        txtStatus=[Resptxt copy];
                    }

    if([txtStatus isEqualToString : @"OK"])
    {
        UIAlertView *info = [[UIAlertView alloc] initWithTitle:@"Info" message: @"The request completed without error. " delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
        [info show];
        [info release];
    }

I am using above code for json parsing. when compiler comes on this line

NSString *Resptxt =[response objectForKey:@"text"];

then compiler terminate and give this error

* Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSCFString objectForKey:]: unrecognized selector sent to instance 0x6166490'

contains of status is

'message': {'code': 0, 'text': 'OK', 'version': '1.1.0'}}

What is problem in this? How i correct it?

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This doesn't look like an error the compiler encounters. Rather it's an error you run into when running your app.

It indicates that you sent to message objectForKey: to a string instance, i.e. response is a string instance. However, this message is normally sent to instance of NSDictionary.

I assume that the JSON response has a different structure than you expect. In particular, it is more deeply nested than your code assumes.

Please post the full JSON answer so we can give you more specific help.

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The response variable is being returned as a NSString (NSCFString) rather than an NSDictionary. NSString doesn't have a objectForKey method which is why the app crashes with that error when you are calling NSString *Resptxt =[response objectForKey:@"text"];

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What it looks like is happening is the objects within status are not dictionaries but strings. The error your getting is saying that when you call the objectForKey: that nscfstring does not respond to it.