Hi,
From acme.sh’s github page, the error seems to be a regular line for manual DNS mode…
As two Issues had been submitted…
https://github.com/Neilpang/acme.sh/issues/1607 | https://github.com/Neilpang/acme.sh/issues/1586
The author does not respond to those issues. (As @schoen stateed, it doesn’t prevent cert being issued… so maybe it was trying to set renewal??)
Thank you