【疑问】2.4.1 新建工程时的:演示自定义网页预览模板 是做什么的?创建后打开就报错。

如题。
运行报错:
Failed to load resource: the server responded with a status of 404 (Not Found)

Error: download failed: assets/resources/config.json, status: 404(no response)
at XMLHttpRequest.xhr.onload (download-file.js:49)