it was the manifest.json it work now because i updated it here the working version  {
"uuid": "tracknum",
"author": "Mohamed Subarashi",
"name": "Add Track Number",
"description": "Provides Numbers for Tracks in Playlist Donwlaod",
"version": "1.0.0",
"icon": "icon.png",
"mediaParser": true,
"mediaListParser" : true,
"scripts": ["msparser.js",
"msbatchparser.js"],
"permissions": ["LaunchPython"],
"dependencies": {"Python": {"minVersion": "3.0"}},
"minApiVersion": 1,
"minFeaturesLevel": 1,
"updateUrl": ""
}