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c++ opencv code Error

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This program demonstrates using the cv::CascadeClassifier class to detect objects (Face + eyes) in a video stream. You can use Haar or LBP features.

Usage: FACE_RECOGNITION_DOOR_ACCESS_SYSTEM.exe [params]

    --eyes_cascade (value:../../data/haarcascades/haarcascade_eye_tree_eyeglasses.xml)

    --face_cascade (value:../../data/haarcascades/haarcascade_frontalface_alt.xml)
  -h, --help

--(!)Error loading face cascade Press any key to continue . . .

Why do I encounter this error? Could you please somebody explain me to avoid this and run my project successfully? Your help me greatly appreciated in this matter.

Thank You