如果得到錯誤指令如下
`Error: listen EADDRINUSE: address already in use :::5000`
解決方法：
First, you would want to know which process is using `port 5000`
```
$ lsof -i :5000
```
this will list all PID listening on this port, once you have the PID you can terminate it with the following
```
$ kill -9 {PID}
```