this is not an aapanel error, but a letsencrypt/cloudflare issue.
this means that uve issued a certificate, reformatted/deleted certificate, issued new certificate, reformatted/deleted certificate, etc. basically youve done it too many times. cloudflare and letsencrypt only allow i think 50 certificates in total
youve probably done this because aapanel seems to have alot of issues with the current update, so you kept adding/removing your domain and now its added an ssl issue.
go to https://crt.sh/ and search your domain. remove all old certificates that have been issued.
the link you posted attached to the error should have some info on it too.