Your app is loading fine in that it is producing an expected error: you are missing a dependency. You need a packages.txt file in addition to your requirements. txt file. The requirements file is for the Python packages (everything you pip install). But any other things that need to be installed go (other software, command line tools, …) goes in the packages file to specify everything for Linux to sudo apt-get install … like libgl1 which includes cv2.
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