CheckError.swift:CheckError(_:):211:kAudioUnitErr_InvalidParameter (CheckError.swift:CheckError(_:):211)

I'm getting this error when I launch my application on the iPhone 14 Pro via Xcode. Everything builds OK. I"m using the audio kit plugin and Sound Pipe Audiokit.

The error starts as soon as I start the app and will carry on repeatedly.

I have background processing turned on as I'd like the sounds to play when the phone is locked via the headphones.

I can't find anything online about this error. None of my catches are printing anything in the logs either. So I don't know if this is just something that pops up repeatedly or whether there is something fundamentally wrong.

private func setupAudioSession() { do { let session = AVAudioSession.sharedInstance() try session.setCategory(.playback, mode: .default, options: [.mixWithOthers]) try session.setActive(true, options: .notifyOthersOnDeactivation) } catch { errorMessage = "Failed to set up audio session: (error.localizedDescription)" print(errorMessage ?? "") } }

// MARK: - Background Task Handling
private func setupBackgroundTaskHandling() {
    // Handle app entering background
    notificationObservers.append(
        NotificationCenter.default.addObserver(
            forName: UIApplication.didEnterBackgroundNotification,
            object: nil,
            queue: .main,
            using: { [weak self] _ in
                // Safely unwrap self
                guard let self = self else { return }
                self.handleBackgroundTransition()
            }
        )
    )

I'm not sure if this is the code causing the issue. Any help would be gratefully appreciated. This is my first app I'm working on .