Your API key doesn’t work. I got this error in the logs:
UnhandledPromiseRejectionWarning: Error: {"cod":401,"message":"Invalid API key. Please see http://openweathermap.org/faq#error401 for more info."}
Try generating a new API key. Also, check in your email for any activation messages. I don’t remember if it needs activating - it’s been quite a while since I generated mine…