v2 client has worse error message than v1

Copied from a user report at Twitter:

I had a typo in an aurora config, where I was resolving a mustache variable outside of a string:

instances = {{profile.instances}}

where I should have been doing

instances = "{{profile.instances}}"

The error message on the v2 client was:

Error executing command: Error loading configuration: name 'profile' is not defined

The v1 client gave me a line number:

File "router.aurora", line 90, in <module>
instances = profile.instances,
NameError: name 'profile' is not defined