Rancher CLI up command error - no such service

Using the Rancher CLI. I can run commands like ‘rancher restart mystack/myservice’ and ‘rancher inspect mystack/myservice’, but when i run ‘rancher up mystack/myservice’ i get a message “no such service”. am I doing something wrong, or is this a CLI bug? Have tried various options on the up command, such as -s to specify stack, but always get same result. Rancher Version installed is 1.6.5.

I want to use CLI, to upgrade a service to a newer image, so really need this to work.

apparently it requires the docker-compose.yml and rancher-compose.yml files, then it works.