清单文件显示404。无法检测服务工作进程下的清单

JSON文件

马尼菲斯特.json

{
 "name": "Sample site",
 "short_name": "Site",
 "description": "Learn how to create and share something or other.",
 "start_url": "index.html",
 "background_color": "#000000",
 "theme_color": "#0f4a73",
 "icons": [{
   "src": "icon/icon-192x192.png",
   "sizes": "256x256",
   "type": "image/png"
 }]
}
<link rel="manifest" href="manifest.json">

服务工作者.js

const RESOURCES_TO_PRELOAD = [
'./',
'./index.html',
'./logo.svg',
'./register-worker.js',
'./todo-app.js',
'./manifest.json',
'./offline-404.html'
];

清单文件显示404。无法检测服务工作进程下的清单。

看看上面的代码有什么解决方案吗?