How to solve chrome extension Icon not working problem

Question

I created a todo Extension and when I tried to give it an icon It said this

"Failed to load extension File: ~\Desktop\Youtube Design\ToDo Mobile App\Extension

Error: Could not load icon 'icon16.png' specified in 'icons'.Could not load manifest."

manifest code:

{
    "name": "ToDo Extension",
    "description": "saves todos",
    "version": "0.0.1",
    "manifest_version": 3,
    "author": "Joyal George K J",
    "icons": {
        "16": "icon16.png",
        "32": "icon32.png",
        "48": "icon48.png",
        "128": "icon128.png"
      },
    "action":{
        "default_popup": "index.html",
        "default_icon": "icon32.png",
        "default_title": "ToDo List Extension"
    },
    "permissions": ["activeTab", "storage"]
}

What is the problem? I did exactly what is said in the documentation (https://developer.chrome.com/docs/extensions/reference/manifest/icons)