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    <p>I see at least one issue with your code, with the line </p> <pre><code>NSURL *fileURL = [NSURL URLWithString:filePath]; </code></pre> <p>It tries to create an URL with a local file path. It will probably return nil. You should instead use:</p> <pre><code>NSURL *fileURL = [NSURL fileURLWithPath:filePath]; </code></pre> <p>Now, even with this, your code does not run (I tried it and got the same error you got). I have not used AVAudioPlayer very much myself so I do not know why your specific error happens.</p> <p>However, I did try a very small example using your code and I was able to play the MP3 correctly. Instead of downloading the data to a file and loading AVAudioPlayer from a file, you can use the initWithData constructor of AVAudioPlayer:</p> <pre><code>AVAudioPlayer *audioPlayer = [[AVAudioPlayer alloc] initWithData:[NSData dataWithContentsOfURL:audioURL] error:&amp;error]; </code></pre> <p>This works fine on my side, assuming that audioURL is valid. I pointed to a mp4 on my server for my test.</p> <p>So rewriting your code with this initWithData gives:</p> <pre><code>- (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:&amp;error]; NSLog(@"%@", error); audioPlayer.delegate = self; [audioPlayer play]; }); }); } </code></pre> <p>Just as a last note: You are downloading the entire file before you start playing, which may take a while and consume a lot of heap (or storage if you were to save it on a file)</p> <p>If you want to stream, you can use a MPMoviePlayerController, but you do not attach the view to your view hierarchy. This way, you will only have audio and will not change any visual of your application.</p> <p>An example would be:</p> <pre><code>NSURL *audioURL = [NSURL URLWithString:@"MY_MP3_URL"]; MPMoviePlayerController* player = [[MPMoviePlayerController alloc] initWithContentURL:audioURL]; [player play]; </code></pre> <p>Again, on my side, in the Simulator, it works fine.</p> <p>Do not forget to release the player. You can also register delegates for important notifications.</p> <p>Details here: <a href="http://developer.apple.com/library/ios/#documentation/mediaplayer/reference/MPMoviePlayerController_Class/Reference/Reference.html" rel="nofollow">http://developer.apple.com/library/ios/#documentation/mediaplayer/reference/MPMoviePlayerController_Class/Reference/Reference.html</a></p>
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    1. COThanks, I'll give this a try. About your last observation, any idea how I could stream the file?
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    2. CODoing this, it stops at the AVAudioPlayer instantiation and prints out this: Catchpoint 10 (exception thrown).Single stepping until exit from function __cxa_throw, which has no line number information. If I continue it just does nothing.
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    3. COI don't know why it works fine on my side then, I used the exact same code that I copied in my answer, except that I used my own URL. Maybe this has something to do with the content at this URL. I was also testing on Simulator 5.0. To answer your question about streaming, use MPMoviePlayerController. I will add another answer to have some readable code.
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