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Heya,
Just came across this answer and decided to write some general guidelines for anyone who comes across this in the future despite the old question.
It seems that you are having trouble running your second Node application on a single Dokku Droplet. Although the logs you’ve provided don’t indicate a distinct reason why this is happening, it’s possible that there might be a problem with how NGINX or Dokku is configured.
Here are a couple of things to check:
Please refer to the DigitalOcean Dokku tutorial for further help:
How To Use the Dokku One-Click DigitalOcean Image to Run a Node.js App
Hope that this helps!