I am new to GCP. I created a cloud-SQL instance (PostgreSQL 14) and tried to connect to it from the app engine.
I am using the following code on github. https://github.com/GoogleCloudPlatform/python-docs-samples/tree/9d4343d0845d6e20e0b08d1242c38aaaf0d9c075/appengine/standard_python3/cloudsql
main_postgres.py-> as my main file
I updated the connection information in the app.yaml file according to the instance and database I created. I did not make any other changes to the main_postgres.py file.
I deployed app engine in the directory with main_postgres.py
After deploying when I go to the link it says :

I am not able to figure out where I am going wrong. any help is appreciated. thanks!
