PubNub Angularjs、频道组出错

Error in PubNub Angularjs, channel group

我已经按照此 DOCUMENT 与 PubNub Angularjs 频道组合作。但是我得到了这个错误:

这是我的代码:

Pubnub.init({
  publish_key: constants.PUBNUB_PUBLISH_KEY,
  subscribe_key: constants.PUBNUB_SUBSCRIBE_KEY,
  uuid: $scope.user.IncubatorContactId + "_Layout",
  error: function(error) {
    console.log('Pubnub.init() Error:', error);
  }
});

Pubnub.channel_group_add_channel({
  callback: function(m) {
    console.log('channel_group_add_channel', 'success', m);
  },
  channel: channels[0],
  channel_group: $scope.user.IncubatorContactId
});

有人请帮助我!

我找到了,channel_group应该是字符串而不是数字:

channel_group: "" + $scope.user.IncubatorContactId + ""