iOS - Attempting to play mp3 file fails
- (IBAction)play:(UIButton *)sender {
    dispatch_queue_t downloadQueue = dispatch_queue_create("audio data downloader", NULL);
    dispatch_async(downloadQueue, ^{
        NSURL *audioURL = [NSURL URLWithString:[NSString stringWithFormat:@"%@%@/%@.mp3", FONYK_FILES_URL, [self.voicenote valueForKeyPath:@"Fonyker.fonykid"], [self.voicenote valueForKeyPath:@"Voicenote.vnid"]]];
        NSData *audioData = [NSData dataWithContentsOfURL:audioURL];

        dispatch_async(dispatch_get_main_queue(), ^{
            NSError *error = nil;
            AVAudioPlayer *audioPlayer = [[AVAudioPlayer alloc] initWithData:audioData error:&error];
            NSLog(@"%@", error);
            audioPlayer.delegate = self;
            [audioPlayer play];
        });
    });
}

Catchpoint 2 (exception thrown).Single stepping until exit from function __cxa_throw, which has no line number information.

Error Domain=NSOSStatusErrorDomain Code=-50 "The operation couldn’t be completed. (OSStatus error -50.)"

Error loading /System/Library/Extensions/AudioIPCDriver.kext/Contents/Resources/AudioIPCPlugIn.bundle/Contents/MacOS/AudioIPCPlugIn:  dlopen(/System/Library/Extensions/AudioIPCDriver.kext/Contents/Resources/AudioIPCPlugIn.bundle/Contents/MacOS/AudioIPCPlugIn, 262): Symbol not found: ___CFObjCIsCollectable
  Referenced from: /System/Library/Frameworks/Security.framework/Versions/A/Security
  Expected in: /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator5.1.sdk/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation
 in /System/Library/Frameworks/Security.framework/Versions/A/Security
2012-04-17 15:03:43.054 Fonyk[8238:15307] Error loading /System/Library/Extensions/AudioIPCDriver.kext/Contents/Resources/AudioIPCPlugIn.bundle/Contents/MacOS/AudioIPCPlugIn:  dlopen(/System/Library/Extensions/AudioIPCDriver.kext/Contents/Resources/AudioIPCPlugIn.bundle/Contents/MacOS/AudioIPCPlugIn, 262): Symbol not found: ___CFObjCIsCollectable
  Referenced from: /System/Library/Frameworks/Security.framework/Versions/A/Security
  Expected in: /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator5.1.sdk/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation
 in /System/Library/Frameworks/Security.framework/Versions/A/Security

NSURL *fileURL = [NSURL URLWithString:filePath];

NSURL *fileURL = [NSURL fileURLWithPath:filePath];

AVAudioPlayer *audioPlayer = [[AVAudioPlayer alloc] initWithData:[NSData dataWithContentsOfURL:audioURL] error:&error];

- (IBAction)play:(UIButton *)sender {
    dispatch_queue_t downloadQueue = dispatch_queue_create("audio data downloader", NULL);
    dispatch_async(downloadQueue, ^{
        NSURL *audioURL = [NSURL URLWithString:[NSString stringWithFormat:@"%@%@/%@.mp3", FONYK_FILES_URL, [self.voicenote valueForKeyPath:@"Fonyker.fonykid"], [self.voicenote valueForKeyPath:@"Voicenote.vnid"]]];
        NSData *audioData = [NSData dataWithContentsOfURL:audioURL];

        dispatch_async(dispatch_get_main_queue(), ^{
            NSError *error = nil;
            AVAudioPlayer *audioPlayer = [[AVAudioPlayer alloc] initWithData:audioData error:&error];
            NSLog(@"%@", error);
            audioPlayer.delegate = self;
            [audioPlayer play];
        });
    });
}

NSURL *audioURL = [NSURL URLWithString:@"MY_MP3_URL"];
MPMoviePlayerController* player = [[MPMoviePlayerController alloc] initWithContentURL:audioURL];
[player play];