运行报错

运行报错，能够上网返回String字符串，但是转换出错：  

java.lang.IllegalStateException: text must not be null
        at com.example.fragments.index.IndexDataConverter.convert(IndexDataConverter.kt:47)
        at com.example.mall_library.ui.recycler.MultipleRecyclerAdapter$Companion.create(MultipleRecyclerAdapter.kt:38)
        at com.example.fragments.index.IndexFragment$initData$1.onSuccess(IndexFragment.kt:58)
        at com.example.mall_library.net.callback.RequestCallbacks.onResponse(RequestCallbacks.kt:25)

具体对应的代码如下：

IndexDataConverter.kt

//构造entity
            val entity=MultipleItemEntity.builder()
                .setField(MultipleFields.ITEM_TYPE,type)
                .setField(MultipleFields.SPAN_SIZE,spanSize)
                .setField(MultipleFields.ID,id)
                .setField(MultipleFields.TEXT,text)//IndexDataConverter.convert(IndexDataConverter.kt:47)
                .setField(MultipleFields.IMAGE_URL,imageUrl)
                .setField(MultipleFields.BANNERS,bannerImages)
                .build()
mEntities.add(entity)//当前的entity放入集合里

MultipleRecyclerAdapter.kt

fun create(converter: DataConverter): MultipleRecyclerAdapter {
//参数：网络下载的数据转换成具体可呈现类型数据
    return MultipleRecyclerAdapter(converter.convert())//MultipleRecyclerAdapter$Companion.create(MultipleRecyclerAdapter.kt:38)
}

IndexFragment.kt

override fun onSuccess(response: String) {
//                    建立adapter,并传输具体可呈现数据类型参数
                    val adapter: MultipleRecyclerAdapter = MultipleRecyclerAdapter
//MultipleRecyclerAdapter伴生对象方法create创建本类实例，
                        // 需要参数data[MutableList<MultipleItemEntity>],即RecyclerView呈现的数据
                        // 从网络下载来的response转换成具体的data
                        .create(IndexDataConverter().setJsonData(response))//IndexFragment$initData$1.onSuccess(IndexFragment.kt:58)
//               绑定adapter
                    mRecyclerView.adapter=adapter
                }

RequestCallbacks.kt

if (response.isSuccessful) {//网络访问请求成功
    if (call.isExecuted) {//执行回调
        if (success != null) {
if (response.body() != null) {
success.onSuccess(response.body()!!)//RequestCallbacks.onResponse(RequestCallbacks.kt:25)
            }
        }
    }
}

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