How to use dns-01 auth on GCE by certbot-dns-google

FYI
I’ve tested few gcloud commands.

Try add a A record:

$ gcloud dns record-sets transaction start -z=zone-hoge-com
$ gcloud dns record-sets transaction add --name test.hoge.com. --ttl 60 --type A --zone zone-hoge-com "192.168.1.1"
$ gcloud dns record-sets transaction execute -z=zone-hoge-com

And successfully finished transaction.

When I tried to add TXT record I got an error.
$ gcloud dns record-sets transaction add "Hello test" --name 4510life.com. --ttl 60 --type TXT --zone zone-4510life-com
ERROR: (gcloud.dns.record-sets.transaction.execute) HTTPError 409: The resource ‘entity.change.additions[1]’ named ‘hoge.com. (TXT)’ already exists

Their is already existing TXT record and I tried to add a new one.
But not sure gcloud command is able to add a multiple TXT records.

Does this error relates to the certbot command error??