在twilio聊天sdk中。无法解析这两个类

import com.twilio.chat.Channel;
import com.twilio.chat.ErrorInfo;

private void initChatClient(String accessToken) {
        try {
            new TwilioChatApp(this.getApplicationContext());
          **TwilioChatApp.get().getTwilioChatClient().createChatClient(accessToken, this);**
            //can't access com.twilio.chat.CallbackListener
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    @Override
    public void onChatClientCreated() {
        Log.e("Chat", "Client created");
      **TwilioChatApp.get().getTwilioChatManager().createChatChannel(liveId, Channel.ChannelType.PUBLIC, LiveStreamActivity.this);**
//can't access com.twilio.chat.ChannelType
    }

@Override
    public void onChatClientError(com.twilio.chat.ErrorInfo errorInfo) {

    }

我是裁判https://www.twilio.com/docs/chat/android/migration-guide-android-0110 文件。但对解决这个问题没什么帮助。