how can i solve this error

It is hard to tell based on the limited information in the image and question, but here goes.

It looks like you are trying to run certbot to obtain an SSL/TLS cert through lets encrypt. It needs to bind to ports 80 and 443 as part of the process but can't. From the message there are 2 possibilities: 1/ another process is running (i.e. web server) that has already bound to the ports and they are not free or 2/ you are running as a non-privileged user that is not allowed to bind with ports less that 1000 (i.e. 80 and 443).

Please try to resolve the issue by running as a privileged user and validating that nothing is already using (bound to) these ports.