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Hi

We have a code snippet
```...
cloud_formation = aws.cloudformation.get_stack(
    name=cloud_formation_config['name']
)
...```
Getting this on `pulumi up` for aws, without stating the actual invalid/unknown key
```Exception: invoke of aws:cloudformation/getStack:getStack failed: invocation of aws:cloudformation/getStack:getStack returned an error: could not validate provider configuration: 1 error occurred:
        * Invalid or unknown key```
Any idea what might be causing this?

Could you file a ticket with a repro in pulumi/pulumi-aws? I believe we fixed these messages to include the address of the key but apparently something either is still broken or regressed. We'd like to fix this. Thank you.