ZERO support for building cloudformation resources and incomplete documentation

I am building my project with cfn submit --set-default . It deploys it successfully, but when i go to create a stack using that new resource i get the following error:

Lambda function handler threw an uncaught exception: Unable to import module 'my_resource_name.handlers': No module named 'my_resource_name'

Nothing else, nothing in the logs. Just a bit of a mystery.