error: could not locate a flask application. use the 'flask --app' option, 'flask_app' environment variable, or a 'wsgi.py' or 'app.py' file in the current directory
error: could not locate a flask application. use the 'flask --app' option, 'flask_app' environment variable, or a 'wsgi.py' or 'app.py' file in the current directory
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