Getting db connection error:-Advanced Node and Express - Implement the Serialization of a Passport User

Tell us what’s happening:
These are not happening:-
Database connection should be present.

Deserialization should now be correctly using the DB and done(null, null) should be erased.

Your code so far

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.122 Safari/537.36.

Challenge: undefined

Link to the challenge: