It is recommended that you catch up on your English.
It has been written very clearly that the restart failed. Why it failed? Because port 9000 has been bound and cannot be bound again. So you can continue to access localhost because the nodejs process is always started.
Have other cmd windows been opened and server.js has been run? This error indicates that you have other programs listening to port 9000, indicating that you have already started it, so this is the server.js you started before
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
It is recommended that you catch up on your English.
It has been written very clearly that the restart failed. Why it failed? Because port 9000 has been bound and cannot be bound again. So you can continue to access localhost because the nodejs process is always started.
Have other cmd windows been opened and server.js has been run? This error indicates that you have other programs listening to port 9000, indicating that you have already started it, so this is the server.js you started before