Jackson/Kotlin: No Creators, like default construct, exist — deserialization error

Hello everyone! I'm new to Kotlin and trying to use Retrofit + Jackson for parsing JSON in Android. I have a simple data class: ```kotlin data class User( val id: Int, val name: String, val email: String ) ``` And a Retrofit interface: ```kotlin interface ApiService { @GET("users/{id}") suspend fun getUser(@Path("id") id: Int): User } ``` But when I try to execute the request, I get an exception: ``` com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot construct instance of `com.example.app.User` (no Creators, like default construct, exist): cannot deserialize from Object value (no delegate- or property-based Creator) at [Source: (BufferedInputStream); line: 1, column: 2] ``` I'm using Jackson via the `jackson-module-kotlin` module. What's the problem? I defined a data class with all fields using val, why can't Jackson create an object? I tried adding @JsonProperty — it didn't help. Please advise how to configure correctly.