0.0.0.0 is the shorthand for all interfaces. You should restrict that to only those required, most likely a localhost address, e.g. 127.0.0.1
4567 is the "port" NodeBB is knocking on, which, for reasons unknown is already in use. There are more modern commands but kicking it old school, you can drive this one:
# netstat -na | grep 4567
tcp 0 0 127.0.0.1:4567 0.0.0.0:* LISTEN
The result above indicates something using tcp on the localhost interface 127.0.0.1 using port 4567. In this instance, NodeBB
Should you get any return for grepping on port 4567 and NodeBB is not running, your next step is to find out what is, wh/I will leave as an exercise.
Good luck and have fun!