Unable to create @Body

Hello, I try to use Moshi with Retrofit, I used Yelp to generate calls and objects (https://github.com/Yelp/swagger-gradle-codegen)

I receive an error : Unable to create @Body converter for class ObjectRequest (parameter #1)

@POST("/xxxxxxx")
fun call(@Body object: ObjectRequest): Single<ObjectResponse>

class ObjectRequest {
    @Json(name = "field")
    var field: String? = null
}

Retrofit.Builder()
            .baseUrl("xxxxxxxxxxxxxx")
            .addConverterFactory(MoshiConverterFactory.create())
            .addCallAdapterFactory(RxJava2CallAdapterFactory.create())
            .client(okHttpClient)
            .build()
            .create(xxxxxx::class.java)

    val moshi = Moshi.Builder()
            .add(XNullableAdapterFactory())
            .add(KotlinJsonAdapterFactory())
            .add(TypesAdapterFactory())
            .build()

Retrofit.Builder()
            .baseUrl("xxxxxxxxxxxxxx")
            .addConverterFactory(MoshiConverterFactory.create(moshi))
            .addCallAdapterFactory(RxJava2CallAdapterFactory.create())
            .client(okHttpClient)
            .build()
            .create(xxxxxx::class.java)

[JakeWharton]

Yes. Moshi does not serialize platform types by default. Change it to the interface List or register an adapter for ArrayList with Moshi.

[zelyon]

My bad, i have auto-formatted some classes with ArrayList instead of List, it works