This does not seem to work and is throwing

Serializer for class 'ApiResponse' is not found

@Serializable
data class ApiResponse<T>(
    val result: T? = null,
    val error: ApiError? = null
)
call.respond(ApiResponse(result = gameEngine.newGame()))

Please help. Json.encodeToString(..) works fine. ktor config:

fun Application.mainModule() {

  install(ContentNegotiation) {
    json()
  }
  ...
}

Using ktor 1.4.1 and serialization 1.0.0

Have you added 

kotlin("plugin.serialization")

  into build.gradle(.kts) file? It has to be added into each 

build.gradle.kts

 file

I am using multiplatform project and I have only one root

build.gradle.kts

with

plugins {
  kotlin("multiplatform") version "1.4.10"
  id("com.github.johnrengelman.shadow") version "5.2.0"
  application
  kotlin("plugin.serialization") version "1.4.10"
  id("com.adarshr.test-logger") version "2.1.1"
}

you have to add this into each

build.gradle.kts

file with entities

I have only 1 build.gradle.kts in whole project....

CC @Aleksei Tirman [JB]

I’m looking for unrar 😉

Alexey, so why does Json.encodeToString works fine for the same. Also, how would I implement my use case of ApiResponse. Do I have to implement a custom serializer?

Yes. It’s not a kotlinx.serialization problem. It’s a problem with ktor + kotlinx.serialization Will you create a bugreport in ktor with you code?

Sure. Thanks

I've created an issue about this problem.