puma error "...in `initialize': Address already in use - bind(2) for "0.0.0.0" port 3100 (Errno::EADDRINUSE)..."
You must terminate the process that's using the port.
Find PID:
$ lsof -wni tcp:3100
Kill the process:
$ kill -9 PID
Last active
July 13, 2018 15:54
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Rails server errors
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