It seems that the certificates you generated in the instance no longer exists. As you can see, the /etc/lego/certificates folder doesn't contain any file
sudo ls -la /etc/lego/certificates
You can recover the dummy certificates we configure in the instance to fix the error you received in Apache
sudo mv /opt/bitnami/apache2/conf/server.crt.old /opt/bitnami/apache2/conf/server.crt
sudo mv /opt/bitnami/apache2/conf/server.key.old /opt/bitnami/apache2/conf/server.key
sudo /opt/bitnami/ctlscript.sh restart apache
Once you restart Apache, you can generate new certificates for your site.
Happy to help!
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