acme.sh defines _err, not _error.
@ -161,7 +161,7 @@ _get_root() {
h=$(printf "%s" "$domain" | cut -d . -f "$i"-100 | sed 's/\./\\./g')
_debug "Checking domain: $h"
if [ -z "$h" ]; then
_error "invalid domain"
_err "invalid domain"
return 1
fi