Getting a runtime error when adding the music to my game, "Thread 1: signal SIGABRT"

    #import "TitleScene.h"
    #import "GamePlayScene.h"

    @interface TitleScene ()
    @property (nonatomic) SKAction *pressStart;
    @end

    @implementation TitleScene
    -(id)initWithSize:(CGSize)size
    {
        if (self = [super initWithSize:size])
        {
           SKSpriteNode *background = [SKSpriteNode spriteNodeWithImageNamed:@"splash_1"];
            background.position = CGPointMake(CGRectGetMidX(self.frame), CGRectGetMidY(self.frame));
            [self addChild:background];
            self.pressStart = [SKAction playSoundFileNamed:@"PressStart.caff" waitForCompletion:NO];
        }

        return self;
    }

    -(void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
    {
        GamePlayScene *gamePlayScene = [GamePlayScene sceneWithSize:self.frame.size];
        SKTransition *transition = [SKTransition fadeWithDuration:1.0];
        [self.view presentScene:gamePlayScene transition:transition];
    }

    @end

    ```