调用 follow 函数时出现 InvalidOrMissingInputException

InvalidOrMissingInputException when calling follow function

当我尝试在 android 中执行后续操作时,出现以下错误。我错过了什么吗?

Feed otherTimeline = streamClient.newFeed("Feed", "user1");
otherTimeline.follow("Feed", "user2");

这里我想让user1关注user2

InvalidOrMissingInputException{statusCode=400, code=4, exception=InputException, detail=Errors for fields 'target'}
    at io.getstream.client.okhttp.repo.handlers.StreamExceptionHandler.handleResponseCode(StreamExceptionHandler.java:42)
    at io.getstream.client.okhttp.repo.StreamRepositoryImpl.handleResponseCode(StreamRepositoryImpl.java:223)
    at io.getstream.client.okhttp.repo.StreamRepositoryImpl.fireAndForget(StreamRepositoryImpl.java:219)
    at io.getstream.client.okhttp.repo.StreamRepositoryImpl.follow(StreamRepositoryImpl.java:101)
    at io.getstream.client.model.feeds.BaseFeed.follow(BaseFeed.java:53)
    at com.ibtspl.startup.fragment.StreamChatFragment$FollowFeed.doInBackground(StreamChatFragment.java:112)
    at com.ibtspl.startup.fragment.StreamChatFragment$FollowFeed.doInBackground(StreamChatFragment.java:106)
    at android.os.AsyncTask.call(AsyncTask.java:295)
    at java.util.concurrent.FutureTask.run(FutureTask.java:237)
    at android.os.AsyncTask$SerialExecutor.run(AsyncTask.java:234)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
    at java.lang.Thread.run(Thread.java:818)

无法关注聚合供稿。在 getstream.io 中只能遵循平面提要,请参阅此 documentation