Responder Lab : Error starting TCP server on port 80, check permissions or other servers running

Hi everyone,

I’m a new guy and I try to do Responder Lab. However, I got an error like below:

$ sudo responder -I tun0
[!] Error starting TCP server on port 80, check permissions or other servers running.

When I tried to check which services were running to kill by taking command:
sudo lsof -i :80 , I saw all HTB cloud services . If I killed these services, I would be disconned with HTB.

How could I solve this problem to catch hash ( NetNTLMv for the Administrator user) ?

Please help solve this problem.
Thank you so much.