VNC connection error

So, I was following this guide https://linuxize.com/post/how-to-install-and-configure-vnc-on-centos-7/ on how to setup a vnc server and I'm at the part where I have to connect to my vnc server via ssh and I'm getting an error. Error: bind: Address already in use channel_setup_fwd_listener_tcpip: cannot listen to port: 5901 Could not request local forwarding.