刚接触node，在安装完express后想要检验下是否安装成功，出错，如下：
npm ERR! missing: ambi@~2.0.0, required by bal-util@2.0.5
npm ERR! missing: ambi@~2.0.0, required by taskgroup@3.1.2
npm ERR! missing: eventemitter2@~0.4.11, required by taskgroup@3.1.2
npm ERR! not ok code 0
这都是什么错呢？求指教~
