我的接口类：

interface Api {
    @GET("wxarticle/chapters/json")
    fun GetWxArticle(): Observable<MovieBean>
}

// Retrofit 

object RetrofitManager {
    private val retrofit = Retrofit.Builder()
        .baseUrl("https://wanandroid.com/")
        .addConverterFactory(GsonConverterFactory.create())
        .addCallAdapterFactory(RxJava2CallAdapterFactory.create())
        .build()

    val mApi = retrofit.create(Api::class.java)
}

//beam类
data class MovieBean (
    val `data`: List<ArticleData>,
    val errorCode: Int,
    val errorMsg: String
):Serializable

data class ArticleData(
    val children: List<Any>,
    val courseId: Int,
    val id: Int,
    val name: String,
    val order: Int,
    val parentChapterId: Int,
    val userControlSetTop: Boolean,
    val visible: Int
)
//在activity的使用

private fun initData() {

    //GetWxArticle
    val wxArticleObservable: Observable<MovieBean> = RetrofitManager.mApi.GetWxArticle()
    wxArticleObservable.subscribeOn(Schedulers.io())//io线程 subscribe
        //将网络结果转换成电影名集合
        .map {
            println("it == null : ${it == null}")
            val array = ArrayList<String>()
            val size = it.data.size
            for (i in 0 until size) {
                array.add(it.data[i].name)
            }
            return@map array
        }
        .observeOn(AndroidSchedulers.mainThread())
        .subscribe(object : Observer<List<String>> {
            override fun onSubscribe(d: Disposable?) {

            }

            override fun onNext(t: List<String>?) {
                val adapter = ArrayAdapter<String>(
                    this@TestActivity,
                    android.R.layout.simple_list_item_1, t!!
                )
                setListAdapter(adapter)//设置adapter 刷新列表
            }

            override fun onError(e: Throwable?) {

            }

            override fun onComplete() {

            }

        })
}

报错是：

这是在说 retrofit 创建的时候添加的callConvertFactory出错了吗？

还是对我定义的这个类不支持呢？

我使用的支持库

//RxJava 库
implementation "io.reactivex.rxjava3:rxjava:3.0.12"
implementation 'io.reactivex.rxjava3:rxandroid:3.0.0'
//Retrofit
implementation 'com.squareup.retrofit2:retrofit:2.3.0'
implementation 'com.squareup.retrofit2:converter-gson:2.3.0'
//implementation 'com.squareup.retrofit2:adapter-rxjava:2.3.0'
// 官方adapter仅支持rxjava1.0
implementation 'com.jakewharton.retrofit:retrofit2-rxjava2-adapter:1.0.0'