Error on connect AudioEngin with AudioPlayerNoded with AVAudioPCMFormatInt16

Hi community,

I'm trying to setup an AVAudioFormat with AVAudioPCMFormatInt16. But, i've an error :

AVAEInternal.h:125 [AUInterface.mm:539:SetFormat: ([[busArray objectAtIndexedSubscript:(NSUInteger)element] setFormat:format error:&nsErr])] returned false, error Error Domain=NSOSStatusErrorDomain Code=-10868 "(null)"

If i understand the error code 10868, the format is not correct. But, how i can use PCM Int16 format ? Here is my method :

- (void)setupAudioDecoder:(double)sampleRate audioChannels:(double)audioChannels {
    if (self.isRunning) {
        return;
    }

    self.audioEngine = [[AVAudioEngine alloc] init];
    self.audioPlayerNode = [[AVAudioPlayerNode alloc] init];

    [self.audioEngine attachNode:self.audioPlayerNode];

    AVAudioChannelCount channelCount = (AVAudioChannelCount)audioChannels;

    self.audioFormat = [[AVAudioFormat alloc] initWithCommonFormat:AVAudioPCMFormatInt16
                                              sampleRate:sampleRate
                                              channels:channelCount
                                              interleaved:YES];

    NSLog(@"Audio Format: %@", self.audioFormat);
    NSLog(@"Audio Player Node: %@", self.audioPlayerNode);
    NSLog(@"Audio Engine: %@", self.audioEngine);

    // Error on this line
    [self.audioEngine connect:self.audioPlayerNode to:self.audioEngine.mainMixerNode format:self.audioFormat];

    
    /**NSError *error = nil;

    if (![self.audioEngine startAndReturnError:&error]) {
        NSLog(@"Erreur lors de l'initialisation du moteur audio: %@", error);
        return;
    }

    [self.audioPlayerNode play];
    self.isRunning = YES;*/
}

Also, i see the audioEngine seem not running ?

Audio Engine: 
________ GraphDescription ________
AVAudioEngineGraph 0x600003d55fe0: initialized = 0, running = 0, number of nodes = 1

Anyone have already use this format with AVAudioFormat ?

Thank you !