nikogamulin/counting-cars

error

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python3 realtime_objectdetection_and_tracking.py
Traceback (most recent call last):
File "realtime_objectdetection_and_tracking.py", line 166, in
net = cv2.dnn.readNet('models/mobilenet-ssd/FP16/mobilenet-ssd.xml', 'models/mobilenet-ssd/FP16/mobilenet-ssd.bin')
cv2.error: OpenCV(4.5.2) /home/pi/opencv/modules/dnn/src/dnn.cpp:3915: error: (-2:Unspecified error) Build OpenCV with Inference Engine to enable loading models from Model Optimizer. in function 'readFromModelOptimizer'

pi = 4b + ncs2
OPENVINO version = 2021.3
please help me