release is unavailable not available in automatic reference counting mode

//

//  main.m

//  helloworld

//

//  Created by Jangsang wook on 2015. 7. 8..

//  Copyright (c) 2015년 smilejsu. All rights reserved.

//

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[]) {

    @autoreleasepool {

        NSMutableString *myString = [ [NSMutableString alloc] init ];

        [ myString appendString:@"Objective-c is cool!" ];

        

        NSMutableString *anotherString = [ NSMutableString stringWithString:@"Objective-c is Cool!"];

        

        NSString *staticString = @"Objective-c is Cool!";

        

        NSArray *anArray = @[@"One", @"Two", @"Three"];

        NSDictionary *aDictionary = @{ @"One":@"A", @"Two":@"B" };

        

        NSLog(@"%@", myString);

        NSLog(@"%@", anotherString);

        NSLog(@"%@", staticString);

        NSLog(@"%@", anArray);

        NSLog(@"%@", aDictionary);

        

        [myString release];

        

        

    }

    return 0;

}

"release is unavailable not available in automatic reference counting mode"

해결 방법 : Apple LLVM 6.1 - Language - Objective C 에서 Objective-C Automatic Reference Counting Yes -> No