Flask-Migrate not working (Failed to find Flask application or factory in module "app"), how to fix?

Question

Flask

The project structure :


app/app.py: contains the initialization of the application itself, the database, etc.

run.py:

from app import app

if __name__ == "__main__":
    app.run(port=5000, host='127.0.0.1', debug=True)

When I try to create a migration using the command flask db migrate -m "ADD: transliteration",
I get the error:

Error: Failed to find Flask application or factory in module "app". Use "FLASK_APP=app:name to specify one.

In the config, I specified How to fix this error? FLASK_APP = 'app:app/app.py'