Error: StereoDepth(4) - No output of StereoDepth is connected/used!

Hi All,

I'm using this code in a headless system

``

so for me is useless (and give me error) enable the "oak.visualize"

        with OakCamera() as oak:

            left = oak.create_camera('left')
            right = oak.create_camera('right')
            stereo = oak.create_stereo(left=left, right=right, fps=30) #, encode='h264')
            stereo.set_auto_ir(auto_mode=True, continuous_mode=True)
        


   
            nn = oak.create_nn('mobilenet-ssd', left)  # mobilenet-ssd

            oak.trigger_action(
                trigger=DetectionTrigger(input=nn, min_detections={'person': 1}, cooldown=30),
                action=onDetectionTrigger(inputs=[nn], dir_path=LOCAL_DETECTION_STORAGE, url=DETECTION_ENDPOINT) 
            )


            # oak.visualize([nn, stereo.out.disparity])

            oak.start(blocking=True)

But if I use this setup I get this error:

StereoDepth(4) - No output of StereoDepth is connected/used!

I'm using stereo only to manage the IR for night-vision.