从firestore读取数据时出错

Question

我正在使用angularfire2从firestore添加和获取数据，并且我保持读写开放。问题是我能够写入数据库，但我在获取数据时没有收到错误：

Exception: TypeError: 'caller', 'callee', and 'arguments' properties may not be accessed on strict mode functions or the arguments objects for calls to them at Function.remoteFunction

这是我正在使用的代码

clientsCollection:AngularFirestoreCollection<UserLogs>;
clientDocs:AngularFirestoreDocument<UserLogs>;
  clients:Observable<UserLogs[]>;
  client:Observable<UserLogs>
  constructor(private afs : AngularFirestore) {
    this.clientsCollection = afs.collection<UserLogs>('logindb');
    this.clients=this.clientsCollection.valueChanges();
    console.log(this.clients);

   }

newClient(client:UserLogs)
{
  this.clientsCollection.add(client).catch(err =>{
    console.log(err);


  });
}