aws code deploy: No such file or directory - appspec.yml

When trying to deploy my rails app through code deploy I get the following error message:

No such file or directory - /opt/codedeploy-agent/deployment-root/b3ff73b4-aa93-4e49-99e4-c26cdcf7a6f0/d-06LE313R9/deployment-archive/appspec.yml

on a "BeforeInstall" error.

I have appspec.yml in my rails app root directory (e.g it is myapp/appspec.yml), and have no idea how to put the appspec file into the deployment-archive directory.