Serialization of a User Object -Passport

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Facing error in Serialization of a User Object Advanced Node & Express Topic

Your code so far!/join/ca7cef8c-1c43-4219-94e7-35f851513207
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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: