I installed the OpenDKIM service and Postfix on my Ubuntu 16.04 server in order to successfully authenticate sent e-mails from one of my domains. I followed a tutorial and did everything exactly the way it said, but I'm getting a "Milter" error when attempting to run or restart the OpenDKIM service. Please see the two attached console screenshots. Any help would be appreciated. I feel like it is something simple, but I just can't get it working...

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