Question in Tutorial docs

In the [example](https://pkl-lang.org/main/current/language-tutorial/01_basic_config.html#entries) for entries I see that object is used as key. But when I evaluate the example it throws the below error

Is the code in the docs correct or am I missing something?

Start with the entries example in the linked language tutorial and reproduce its evaluation to compare the documented code with the reported error. Done means determining whether the example is valid and correcting the tutorial if it is not.

Written by the indexing model from the issue text.