Address Already in Use

Couldn't pass ProxyInitializeEvent to bungeeafk <version>
java.net.BindException: Address already in use: bind

If you encounter the issue java.net.BindException: Address already in use: bind on startup, it means that the default netty port (9000) is already in use by another application on your system. To resolve this issue, you need to change the netty port configuration for both the proxy and subserver.

You can find the guide to resolve this exception here: Netty Channel Configuration