[Python] Flask shows TypeError: send_from_directory() missing 1 required positional argument:...

When I deploy my Flask app on Azure, the view raises TypeError: send_from_directory() missing 1 required positional argument: 'path'. This isn't happening when I run locally.

from flask import send_from_directory

@app.route('/download/<path:filename>', methods=['GET', 'POST'])
def download(filename):
uploads = os.path.join(app.root_path, app.config['UPLOAD_FOLDER'])
return send_from_directory(directory=uploads, filename=filename)

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