Npm Bigbluebutton开发html5客户端未启动

我已经按照官方文档设置了bigbluebutton开发环境，但是html5客户端没有启动，抛出了以下错误。尝试使用不同的服务器，但出现相同错误

     if (oldPresenter?.userId !== currentPresenterId) {
W20201227-04:07:46.391(0)? (STDERR)                      ^
W20201227-04:07:46.392(0)? (STDERR)
W20201227-04:07:46.392(0)? (STDERR) SyntaxError: Unexpected token .
W20201227-04:07:46.392(0)? (STDERR)     at createScript (vm.js:80:10)
W20201227-04:07:46.393(0)? (STDERR)     at Object.runInThisContext (vm.js:139:10)
W20201227-04:07:46.393(0)? (STDERR)     at /home/ubuntu/dev/bigbluebutton/bigbluebutton-html5/.meteor/local/build/programs/server/boot.js:393:30
W20201227-04:07:46.393(0)? (STDERR)     at Array.forEach (<anonymous>)
W20201227-04:07:46.394(0)? (STDERR)     at /home/ubuntu/dev/bigbluebutton/bigbluebutton-html5/.meteor/local/build/programs/server/boot.js:220:19
W20201227-04:07:46.394(0)? (STDERR)     at /home/ubuntu/dev/bigbluebutton/bigbluebutton-html5/.meteor/local/build/programs/server/boot.js:471:5
W20201227-04:07:46.394(0)? (STDERR)     at Function.run (/home/ubuntu/dev/bigbluebutton/bigbluebutton-html5/.meteor/local/build/programs/server/profile.js:510:12)
W20201227-04:07:46.395(0)? (STDERR)     at /home/ubuntu/dev/bigbluebutton/bigbluebutton-html5/.meteor/local/build/programs/server/boot.js:470:11

if（oldPresenter？.userId！==currentPresenterId）{
W20201227-04:07:46.391（0）？（标准）^
W20201227-04:07:46.392（0）？（标准）
W20201227-04:07:46.392（0）？（标准）语法错误：意外标记。
W20201227-04:07:46.392（0）？（STDERR）位于createScript（vm.js:80:10）
W20201227-04:07:46.393（0）？（STDERR）位于Object.runInThisContext（vm.js:139:10）
W20201227-04:07:46.393（0）？（STDERR）在/home/ubuntu/dev/bigblubbutton/bigblubbutton-html5/.meteor/local/build/programs/server/boot.js:393:30
W20201227-04:07:46.393（0）？（标准）在Array.forEach（）处
W20201227-04:07:46.394（0）？（STDERR）位于/home/ubuntu/dev/bigblubbutton/bigblubbutton-html5/.meteor/local/build/programs/server/boot.js:220:19
W20201227-04:07:46.394（0）？（STDERR）位于/home/ubuntu/dev/bigblubbutton/bigblubbutton-html5/.meteor/local/build/programs/server/boot.js:471:5
W20201227-04:07:46.394（0）？（STDERR）位于Function.run（/home/ubuntu/dev/bigbluberbutton/bigbluberbutton-html5/.meteor/local/build/programs/server/profile.js:510:12）
W20201227-04:07:46.395（0）？（STDERR）位于/home/ubuntu/dev/bigblubbutton/bigblubbutton-html5/.meteor/local/build/programs/server/boot.js:470:11

我没有更改任何文件

---

nodejs版本v8.17.0

node 8不支持

x？.y

语法。您需要使用老式语法：

     if (oldPresenter && oldPresenter.userId !== currentPresenterId) {

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或者不管你的逻辑是什么。

我将note更新为最新的相同错误，我假设你的意思是“node”而不是“note”，对吗？但即使是这样，我的答案对你不起作用吗？应该！是的，我的意思是Node:），不幸的是没有起作用。但对于其他人来说，新安装的bigbluebutton dev env也有同样的问题，你应该签出V2.2.x-release分支，错误就会消失。