在使用LIveQuery的过程中，构建好了查询条件语句
LCQuery refreshSpeed = new LCQuery("speed");
之后进行订阅操作
LCLiveQuery liveQuery = await refreshSpeed.Subscribe();
发生报错，无法触发Oncreat、Onupdate等事件
LCException: Exception of type 'LeanCloud.LCException' was thrown.
LeanCloud.Common.LCHttpClient+d__16`1[T].MoveNext () (at :0)
