TypeError: 'NoneType' object is not subscriptable

[Potracheno]

python3 simple_example_v3.py

pygame 2.5.2 (SDL 2.28.2, Python 3.10.0)
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WARNING: All log messages before absl::InitializeLog() is called are written to STDERR
I0000 00:00:1753013036.279139   32217 gl_context_egl.cc:85] Successfully initialized EGL. Major : 1 Minor: 5
I0000 00:00:1753013036.281840   32301 gl_context.cc:344] GL version: 3.2 (OpenGL ES 3.2 Mesa 24.2.8-1ubuntu1~24.10.1), renderer: Mesa Intel(R) UHD Graphics 630 (CFL GT2)
INFO: Created TensorFlow Lite XNNPACK delegate for CPU.
Traceback (most recent call last):
  File "/home/user/EyeGestures/examples/simple_example_v3.py", line 79, in <module>
    event, calibration = gestures.step(frame, calibrate, screen_width, screen_height, context="my_context")
  File "/home/user/miniconda3/envs/eye/lib/python3.10/site-packages/eyeGestures/__init__.py", line 142, in step
    key_points, blink, sub_frame = self.getLandmarks(frame)
  File "/home/user/miniconda3/envs/eye/lib/python3.10/site-packages/eyeGestures/__init__.py", line 65, in getLandmarks
    self.face.process(
  File "/home/user/miniconda3/envs/eye/lib/python3.10/site-packages/eyeGestures/face.py", line 81, in process
    self.landmarks = self._landmarks(self.face)
  File "/home/user/miniconda3/envs/eye/lib/python3.10/site-packages/eyeGestures/face.py", line 67, in _landmarks
    __complex_landmarks = __complex_landmark_points[0].landmark
TypeError: 'NoneType' object is not subscriptable

python3 troubleshooting_camera.py works