Inside /mongodb-core/lib/auth, your try/catch for the Kerberos module is hitting the console with an error if Kerberos is not installed and there is no plan on ever using Kerberos communication. See Below:

try

{ Kerberos = require_optional('kerberos').Kerberos // Authentication process for Mongo MongoAuthProcess = require_optional('kerberos').processes.MongoAuthProcess }

catch(err)

{ console.dir(err) }

Please remove the console.dir statement, as it not signaling that there is truly an error, but that Kerberos is just not installed.