[google-cloud-sql-discuss] CloudSQL connection issues with deployed Bookshelf tutorial app (App Engine/NodeJS)

i deployed the my code on app engine with node js (flex environment). 

 ==========================================

config.json 

{

  "GCLOUD_PROJECT": "XXXXXX",

  "DATA_BACKEND": "cloudsql",

  "MYSQL_USER": "XXXX",

  "MYSQL_PASSWORD": "XXXXX",

  "INSTANCE_CONNECTION_NAME": "XXXXXX:us-central1:XXXXX"

}

===============================================================

model-cloudsql.js

const options = {

  user: config.get('MYSQL_USER'),

  password: config.get('MYSQL_PASSWORD'),

  database: 'XXXXX'

};

if (config.get('INSTANCE_CONNECTION_NAME') && config.get('NODE_ENV') === 'production') {

  options.socketPath = `/cloudsql/${config.get('INSTANCE_CONNECTION_NAME')}`;

}

const connection = mysql.createConnection(options);

i am getting the error : "Cannot enqueue Query after fatal error."

please provides any feedback on it. 

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