Certbot not renewing

I am trying to renew my lets encrypt certificates using the command
“certbot renew” but the response i get is “another instance of certbot already running”
I dont understand why this is happening because i have renewed certificates using this method couple of times before.

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The other instance may be stuck.
Can you reboot?
[that may be the quickest fix]

Renewals should be automated - set them and forget them.

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Did you put it in cron and forget the -n switch? If you want to skip the reboot, run lslk or lslocks and look for the .certbot.lock files, that’ll tell you which process to kill. Then you can run it interactively to figure out why it wants your attention – it probably wants to update itself.

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