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If opencv file dose not exits in /usr/share, Create folder in /usr/share called ''opencv'' using SUDO then create "haarcascades". search for " haarcascade_frontalface_alt.xml " in all your files then copy it using '' sudo cp -i /home/catkin_ws/ haarcascade_frontalface_alt.xml /usr/share/opencv/haarcascade/ " change /home/catkin_ws/ haarcascade_frontalface_alt.xml to haarcascade_frontalface_alt.xml original file directory.

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