```$ superset db init\nLoaded your LOCAL configuration at [/app/pythonpath/superset_config.py]\nlogging was configured successfully\nINFO:superset.utils.logging_configurator:logging was configured successfully\n/usr/local/lib/python3.7/site-packages/flask_caching/__init__.py:192: UserWarning: Flask-Caching: CACHE_TYPE is set to null, caching is effectively disabled.\n  "Flask-Caching: CACHE_TYPE is set to null, "\nERROR:root:Error: Directory /app/superset/migrations already exists and is not empty```\n