After more fiddling, I get this in terminal:

[MMM-Facial-Recognition-OCV3] Facerecognition started... [MMM-Facial-Recognition-OCV3] Loading training data... [MMM-Facial-Recognition-OCV3] Training data loaded! [MMM-Facial-Recognition-OCV3] -------------------- [MMM-Facial-Recognition-OCV3] PiCam loaded... Whoops! There was an uncaught exception... { Error: mmal: mmal_vc_port_enable: failed to enable port vc.null_sink:in:0(OPQV): ENOSPC mmal: mmal_port_enable: failed to enable connected port (vc.null_sink:in:0(OPQV))0x6c513840 (ENOSPC) mmal: mmal_connection_enable: output port couldn't be enabled Exception in thread Thread-1: Traceback (most recent call last): File "/usr/lib/python2.7/threading.py", line 801, in __bootstrap_inner self.run() File "/home/pi/MagicMirror/modules/MMM-Facial-Recognition-OCV3/lib/common/picam.py", line 25, in run with picamera.PiCamera() as camera: File "/usr/lib/python2.7/dist-packages/picamera/camera.py", line 433, in __init__ self._init_preview() File "/usr/lib/python2.7/dist-packages/picamera/camera.py", line 513, in _init_preview self, self._camera.outputs[self.CAMERA_PREVIEW_PORT]) File "/usr/lib/python2.7/dist-packages/picamera/renderers.py", line 558, in __init__ self.renderer.inputs[0].connect(source).enable() File "/usr/lib/python2.7/dist-packages/picamera/mmalobj.py", line 2212, in enable prefix="Failed to enable connection") File "/usr/lib/python2.7/dist-packages/picamera/exc.py", line 184, in mmal_check raise PiCameraMMALError(status, prefix) PiCameraMMALError: Failed to enable connection: Out of resources OpenCV Error: Assertion failed (!buf.empty() && buf.isContinuous()) in imdecode_, file /home/pi/opencv/modules/imgcodecs/src/loadsave.cpp, line 637 Traceback (most recent call last): File "modules/MMM-Facial-Recognition-OCV3/lib/mm/facerecognition.py", line 69, in <module> image = camera.read() File "/home/pi/MagicMirror/modules/MMM-Facial-Recognition-OCV3/lib/common/picam.py", line 55, in read image = cv2.imdecode(data, 1) cv2.error: /home/pi/opencv/modules/imgcodecs/src/loadsave.cpp:637: error: (-215) !buf.empty() && buf.isContinuous() in function imdecode_ at PythonShell.parseError (/home/pi/MagicMirror/modules/MMM-Facial-Recognition-OCV3/node_modules/python-shell/index.js:190:17) at terminateIfNeeded (/home/pi/MagicMirror/modules/MMM-Facial-Recognition-OCV3/node_modules/python-shell/index.js:98:28) at ChildProcess.<anonymous> (/home/pi/MagicMirror/modules/MMM-Facial-Recognition-OCV3/node_modules/python-shell/index.js:88:9) at ChildProcess.emit (events.js:182:13) at Process.ChildProcess._handle.onexit (internal/child_process.js:237:12) executable: 'python', options: null, script: 'modules/MMM-Facial-Recognition-OCV3/lib/mm/facerecognition.py', args: [ '{"threshold":80,"useUSBCam":false,"trainingFile":"/home/pi/MagicMirror/modules/MMM-Facial-Recognition-OCV3/training.xml","interval":2,"logoutDelay":15,"users":["Stiofan","Gab"],"defaultClass":"default","everyoneClass":"everyone","welcomeMessage":true}' ], exitCode: 1 } MagicMirror will not quit, but it might be a good idea to check why this happened. Maybe no internet connection? If you think this really is an issue, please open an issue on GitHub: https://github.com/MichMich/MagicMirror/issues