Errors during init provide insufficient guidance when missing required fields

[jupierce]

Versions

Tectonic version (release or commit hash):

78e6f76292331a7fadc57ce3f362e558890fde84

Terraform version (terraform version):

Terraform v0.11.7

Platform (aws|azure|openstack|metal|vmware):

aws

What happened?

As a new user to tectonic init, tried populating aws config example. Clearly missing some fields in the file, but error output from is not always indicative of missing field:

15:47 $ tectonic init --config=examples/tectonic.aws.yaml
ERRO[0000] Found 1 error in the cluster definition:     
ERRO[0000] error 1: open : no such file or directory    
FATA[0000] found 1 cluster definition error   

What you expected to happen?

Error should identify which field is missing.

How to reproduce it (as minimally and precisely as possible)?

aws config file without required file fields.

[crawford]

This refers to the old installer which has since been deleted. If you are still having trouble with the new installer, feel free to open a new issue.