Sip.js: DOMException: Gagal menjalankan 'setRemoteDescription' di 'RTCPeerConnection': Gagal mengurai SessionDescription. [objek Objek] Garis harapan: v=

Jelaskan bugnya
Tidak bekerja lib dengan benar.

DOMException: Gagal menjalankan 'setRemoteDescription' di 'RTCPeerConnection': Gagal mengurai SessionDescription. [objek Objek] Garis harapan: v=
di http://localhost/sip-0.11.4%20 (1).js:9733:38

Saya mendapat masalah di bagian kode yang sama:

` /**
* Atur deskripsi jarak jauh ke implementasi media yang mendasarinya
* @param {String} sessionDescription Deskripsi yang diberikan oleh pesan SIP untuk ditetapkan pada implementasi media
* @param {Object} [options] Opsi objek yang akan digunakan oleh getDescription
* @param {MediaStreamConstraints} [options.constraints] MediaStreamConstraints https://developer.mozilla.org/en-US/docs/Web/API/MediaStreamConstraints
* @param {Object} [options.peerConnectionOptions] Jika ini disetel, koneksi rekan akan dibuat ulang dengan opsi baru
* @param {Array} [pengubah] Array dengan pengubah deskripsi penggunaan satu kali
* @returns {Janji} Janji yang
*/
setDescription: { dapat ditulis: true, nilai: function setDescription(sessionDescription, options, modifiers) {
var _ini = ini;

    var self = this;

    options = options || {};
    if (options.peerConnectionOptions) {
      this.initPeerConnection(options.peerConnectionOptions);
    }

    modifiers = modifiers || [];
    if (!Array.isArray(modifiers)) {
      modifiers = [modifiers];
    }
    modifiers = modifiers.concat(this.modifiers);

    var description = {
      type: this.hasOffer('local') ? 'answer' : 'offer',
      sdp: sessionDescription
    };

    return SIP.Utils.Promise.resolve().then(function () {
      // Media should be acquired in getDescription unless we need to do it sooner for some reason (FF61+)
      if (this.shouldAcquireMedia && this.options.alwaysAcquireMediaFirst) {
        return this.acquire(this.constraints).then(function () {
          this.shouldAcquireMedia = false;
        }.bind(this));
      }
    }.bind(this)).then(function () {
      return SIP.Utils.reducePromises(modifiers, description);
    }).catch(function (e) {
      if (e instanceof SIP.Exceptions.SessionDescriptionHandlerError) {
        throw e;
      }
      var error = new SIP.Exceptions.SessionDescriptionHandlerError("setDescription", e, "The modifiers did not resolve successfully");
      _this.logger.error(error.message);
      self.emit('peerConnection-setRemoteDescriptionFailed', error);
      throw error;
    }).then(function (modifiedDescription) {
      self.emit('setDescription', modifiedDescription);
      return self.peerConnection.setRemoteDescription(modifiedDescription);
    }).catch(function (e) {
      if (e instanceof SIP.Exceptions.SessionDescriptionHandlerError) {
        throw e;
      }
      // Check the original SDP for video, and ensure that we have want to do audio fallback
      if (/^m=video.+$/gm.test(sessionDescription) && !options.disableAudioFallback) {
        // Do not try to audio fallback again
        options.disableAudioFallback = true;
        // Remove video first, then do the other modifiers
        return _this.setDescription(sessionDescription, options, [SIP.Web.Modifiers.stripVideo].concat(modifiers));
      }
      var error = new SIP.Exceptions.SessionDescriptionHandlerError("setDescription", e);
      _this.logger.error(error.error);
      _this.emit('peerConnection-setRemoteDescriptionFailed', error);
      throw error;
    }).then(function setRemoteDescriptionSuccess() {
      if (self.peerConnection.getReceivers) {
        self.emit('setRemoteDescription', self.peerConnection.getReceivers());
      } else {
        self.emit('setRemoteDescription', self.peerConnection.getRemoteStreams());
      }
      self.emit('confirmed', self);
    });
  } },`