问远端用户退出时取消远端订阅报错？

代码

/* 监听远端退出会议 (删除退出用户视频墙) */

EventDistalExit() {

this.client.on('stream-removed', (event) => {

let remoteStream = event.stream;

this.client.unsubscribe(remoteStream); // 这部报的错 // 这部报的错

// 这部报的错

// 这部报的错

// 这部报的错

let userId = remoteStream.getUserId();

// 查找到当前退出的用户在数组的索引值

let i = this.userList.findIndex(function (user) {

return user.userId == userId;

        });

//将该用户从数组中进行删除

this.userList.splice(i, 1);

console.log(

remoteStream,

'remoteStreamremoteStreamremoteStreamremoteStream'

        );

// 停止远端用户流

remoteStream.stop();

remoteStream.close();

let userIdDom = document.querySelector(`#user${userId}`);

if (userIdDom) {

userIdDom.remove();

        }

this.$message(`远端用户${userId}已经退出会议室`);

delete this.stream[userId];

console.log('远端用户退出成功');

      });

    },

错误提示 remoteStream does not exist because it has been unpublished by remote peer. Refer

他说remoteStream不存在，因为它已经被远程对等端取消发布