PeerJS：无法设置本地报价sdp

Question

嘿，我正在使用peerjs创建视频聊天，但是出现了此错误：

我遵循了教程，并根据它并使用Modern API编写了所有内容，但是无论如何，这是我的代码

function openStream(){
   const config = {video: true, audio: true};
   return navigator.mediaDevices.getUserMedia(config)
}

function playStream(id,stream){
   const video = document.getElementById(id);
   video.srcObject = stream;
   video.play()
}

const peer = new Peer({key: 'lwjd5qra8257b9'})

peer.on('open', (id)=>{
  console.log(id)
  $('#myid').append(id)
})

$('button').click(() => {
  const id = $('#remoteid').val();
  openStream()
  .then(stream => {
    playStream('localVideo', stream);
    const call = peer.call(id, stream);
    call.on('stream', remoteStream => playStream('remoteVideo', 
  remoteStream));
  });
});

//Callee
peer.on('call', call => {
    openStream()
    .then(stream => {
       call.answer(stream);
       playStream('localVideo', stream);
      call.on('stream', remoteStream => playStream('remoteVideo', 
remoteStream));
    });

那怎么了？有帮助吗？谢谢！     }）;