Hey I've been trying to play with the new Automation API and I tried running one of the example and I get the following error

Successfully setup workspace
Installing the AWS plugin
Successfully installed AWS plugin
Logged user: yarin
Failed to create or select stack: failed to create stack: code: 255
, stdout: 
, stderr: error: stack names may not contain slashes

: exit status 255: failed to select stack: code: 255
, stdout: 
, stderr: error: no stack named 'yarin/project-name/stack-name' found

: exit status 255