我的程序是按照官方文件逐步编写的，命令也是如此。port 3000不使用。为什么我不能启动端口3000？
E:My Office Add-in>npm start
> office-addin-taskpane-js@0.0.1 start E:My Office Add-in
> office-addin-debugging start manifest.xml
Debugging is being started...
App type: desktop
Enabled debugging for add-in af71531f-d6c5-4ff3-854d-7b8dc52e3dcd. Debug method: 0
Starting the dev server... (webpack-dev-server --mode development)
Unable to start the dev server. Error: The dev server is not running on port 3000.
Sideloading the Office Add-in...
Debugging started.
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我的问题几乎完全相同，我使用sudo解决了：
sudo npm start