/etc/keystone/fernet-keys/ does not contain keys, use keystone-manage fernet_setup to create Fernet keys

Question

I'm deploying openstack infrastructure - Victoria version with unbuntu pro 20.04 LTS. I run into the identity service - keystone in the controller node.

I follow the process explained in this article. I typed all cmds :

su -s /bin/sh -c "keystone-manage db_sync" keystone

keystone-manage fernet_setup --keystone-user XXXXXXXX --keystone-group XXXXXXXX

keystone-manage credential_setup --keystone-user XXXXXXXX --keystone-group XXXXXXXX
      
keystone-manage bootstrap --bootstrap-password YYYYYYYYY --bootstrap-admin-url http://controller:5000/v3/ --bootstrap-internal-url http://controller:5000/v3/ --bootstrap-public-url http://controller:5000/v3/ --bootstrap-region-id ZZZZZZZ

But, I cope with this error message :

/etc/keystone/fernet-keys/ does not contain keys, use keystone-manage fernet_setup to create Fernet keys.