tunnel won't run

[sohrabp72]

root@Helsinki:~# udptunnel -s 444 -v 127.0.0.1/433
Listening for TCP connections on port 444
setup_udp_recv: bind: Address already in use

why is that?
which port is in use?
I got confused, it should accepts tcp packets on port 444 and forward them on udp port 433 on the server which another process is listening to(433 UDP)
there is no process listening on port 444.

[rfc1036]

There is another process listening on the port, as the error message clearly explained.

[sohrabp72]

which port?
I got confused, I need to accept TCP connection 444 and forward packets to UDP port 433.
Wireguard service is listening on UDP port 433 and I have to deliver packets to 433 UDP port.
Can you guide me on how to instruct the command to achieve that, please?