Reachability change cause crash

Question

Apple developer sample of Reachability cause Memory Leak when turning off wifi during play offline music (using this code) in my app and it got stuck line I mentioned bottom, It may cause by that Player code because log says [__NSCFString reachabilityDidChange:]: unrecognized selector

[[NSNotificationCenter defaultCenter] postNotificationName:kReachabilityChangedNotification object:noteObject];

in this method:

static void ReachabilityCallback(SCNetworkReachabilityRef target, SCNetworkReachabilityFlags flags, void* info)
{
#pragma unused (target, flags)
    NSCAssert(info != NULL, @"info was NULL in ReachabilityCallback");
    NSCAssert([(__bridge NSObject*) info isKindOfClass: [CDVReachability class]], @"info was wrong class in ReachabilityCallback");

    CDVReachability* noteObject = (__bridge CDVReachability *)info;
    // Post a notification to notify the client that the network reachability changed.
    [[NSNotificationCenter defaultCenter] postNotificationName: kReachabilityChangedNotificationString object: noteObject];
}

Here is log:

2015-04-12 19:52:03.416 HelloCordova[4094:1250289] -[__NSCFString reachabilityDidChange:]: unrecognized selector sent to instance 0x174232820

And reachabilityDidChange is in this file

#import "ReachabilityManager.h"
#import "Reachability.h"

@interface ReachabilityManager ()
@property NetworkStatus previousReachability;
@end

@implementation ReachabilityManager

- (id) init {
    self = [super init];
    if (self) {
        [[NSNotificationCenter defaultCenter] addObserver:self
                                                selector:@selector(reachabilityDidChange:)
                                                name:kReachabilityChangedNotification
                                                object:nil];
        self.previousReachability = -1;
    }
    return self;
}

- (void) reachabilityDidChange:(NSNotification *)notification {
    NSLog(@"reachabilityDidChange!");

    CDVReachability * r = [notification object];
    NetworkStatus ns = [r currentReachabilityStatus];

    if (self.delegate && [self.delegate respondsToSelector:@selector(reachabilityDidChangeFrom:to:)]) {
        [self.delegate reachabilityDidChangeFrom:self.previousReachability to:ns];
    }
    self.previousReachability = ns;
}

@end

I don't know is that correct but I try this:

dispatch_async(dispatch_get_main_queue(), ^{
        [[NSNotificationCenter defaultCenter] postNotificationName:kReachabilityChangedNotification object:noteObject];
    });}

and even this:

// We're on the main RunLoop, so an NSAutoreleasePool is not necessary, but is added defensively
    // in case someon uses the Reachability object in a different thread.
    @autoreleasepool {
        Reachability* noteObject = (__bridge Reachability*)info;
        // Post a notification to notify the client that the network reachability changed.
        [[NSNotificationCenter defaultCenter] postNotificationName:kReachabilityChangedNotification object:noteObject];
    }