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That's bizarre, I wonder if we're somehow not printing the entire error message. If you run with extra logging enabled, does it reveal anything more useful?

```
$ pulumi --logtostderr -v=9 up
```

Thanks Joe, this is a nice trick to remember! Though it didn’t help much because it seems it is AWS’s API lousy error messages. According to their documentation a `ValidationError` is because some of my inputs fails to satisfy the consttraints specified by AWS; but it doesn’t say which ones.