Hacktoberfest is an annual celebration by Digital Ocean, GitHub, Intel, and DEV Community to promote participation in open source projects, such as NodeBB. All you need to do is submit 4 pull requests within in the month of October!
The port 4567 is away in use, possibly do to nodebb already running. Google "how to kill process on port" and you should be able to kill whatever process is already running.
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