Sometimes I get this error when trying to run a Vapor application from Xcode. Reopening Xcode doesn't help, only restarting of system do. Is it a bug of the framework? What should I do to prevent this?
sudo does not fix this message, it means something is already bound to this port. It could be an instance of Vapor that didn't close correctly.
To fix this, you need to kill the previous instance. The easiest way to do this is:
lsof -i tcp:8080
8080 is the port you are trying to use. This outputs something like:
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME com.apple 4679 tanner 8u IPv4 0x890f6b0b31966939 0t0 TCP
Then kill the process bound to that port using its