You need to kill the other certbot process.
You can do that by rebooting the box.
Or by killing the specific process.
To find the certbot process, try:
ps -ef | grep certb
The process ID would be the first number after the user, like:
root 5555 5100 …
To kill the process, try:
kill 5555
((replace 5555 with your actual certbot PID#))
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