DiscoverStore.kt

{
...
fetcher = Fetcher.of { 
    val apiResponse = remoteDataSource.getPopularShows(page = 1)
     when (apiResponse) {  
      is ApiResponse.Success -> {  
         // Map and cache data to local-source.
      }  
      is ApiResponse.Error.HttpError -> throw Throwable("${response.errorMessage}")  
      is ApiResponse.Error.GenericError -> throw Throwable("${response.errorMessage}")  
      is ApiResponse.Error.SerializationError -> throw Throwable("${response.errorMessage}")
 }
}