"No default certificate, generating one" when starting Traefik

Traefik Traefik v2
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1

Hi, I'm using Traefik 2.2.8. I have obtained let's encrypt certificate using cert-manager and stored it in secret, and then I added a TLS Store as follow:

apiVersion: traefik.containo.us/v1alpha1
kind: TLSStore
metadata:
  name: default
  namespace: traefik

spec:
  defaultCertificate:
    secretName: le-cert-secret

When starting Traefik, "No default certificate, generating one" is shown in the log, am I missing some configuration?

Thank you.