감자의 실수

1.[Node.js] Error : Cannot read property 'length' of undefined

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2.[Node.js] Error : connect ECONNREFUSED 127.0.0.1:3306

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3.[Node.js] Error: No default engine was specified and no extension was provided.

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4.[Node.js] BSON TypeError: Argument passed in must be a string of 12 bytes or a string of 24 hex characters or an integer

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