Unresolved reference : retrofit while creating retorfit instance.

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Android

Kotlin

I am working on an android app which request Mars photos ans use it to display it on screen.
To make an request.And trying to use A public Api object that exposes the lazy-initialized Retrofit service.
below is source code with error

import retrofit2.Retrofit
import retrofit2.converter.scalars.ScalarsConverterFactory
import retrofit2.http.GET

class MarsApiService {
    public val retrofit = Retrofit.Builder()
        .addConverterFactory(ScalarsConverterFactory.create())
        .baseUrl(Companion.BASE_URL)
        .build()
    interface MarsApiService{
        @GET("photos")
        fun getPhotos(): String
    }
    object MarsApi {
        val retrofitService: MarsApiService by lazy { retrofit.create(MarsApiService::class.java) }
    }



    companion object {
        private const val BASE_URL = "https://android-kotlin-fun-mars-server.appspot.com"
    }
}

17th line the code inside object MarsApi pops up errors Unresolved reference : retrofit. The call to create() function on a Retrofit object is expensive and the app needs only one instance of Retrofit API service. So, i exposed the service to the rest of the app using object declaration.

What I have tried:

The code is working if i bring code inside object MarsApi out but doing so may result in multiple instance of retrofit.