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kotlinlang

Hi people, I'm new in KGraphQL and  I have the same problem that  Tomas Kormanak solved...
My problem is that I can't understand how he solved it.

My case:

```            mutation("bookAppointment") {
                resolver {
                        day: LocalDate,
                        player: Player,
                    -&gt;
                    return@resolver "It worked!"
                }
            }```
```data class Player (
    val id: String?,
)```

error:
```{
  "error": "Introspection must provide output type for fields, but received: Player!."
}```

I solved it!

I now understand Tomas answer, one of my query response types, had a Player parameter type, so Player was a Type and an Input Type, (input and output)...

btw I don't know why that is a problem... but solved :white_check_mark: