"Manifest parsing has failed." in Developer Portal

It has happened to me also. I'm following the tutorial from https://docs.microsoft.com/en-us/microsoftteams/platform/sbs-gs-nodejs?tutorial-step=3 and i have a trial developer account with admin rights.

When i want to see the manifest.json it does not appear in the "App package" right pane. If i try to "Preview in Teams" it shows the same error as stated above

Sayali-MSFT

Thank you for replying.

This is the manifest file (And I attached the app package zip file).

I want to add a personal tab for the app. The tab URL is sample. Any other URLs causes the same issue.

{
  "$schema": "https://developer.microsoft.com/en-us/json-schemas/teams/v1.12/MicrosoftTeams.schema.json",
  "version": "1.0.0",
  "manifestVersion": "1.12",
  "id": "945a7eaf-60e2-4a17-9488-552215189da5",
  "packageName": "com.package.name",
  "name": {
    "short": "SampleApp",
    "full": "SampleApp"
  },
  "developer": {
    "name": "karamem0",
    "mpnId": "",
    "websiteUrl": "https://github.com/karamem0",
    "privacyUrl": "https://github.com/karamem0",
    "termsOfUseUrl": "https://github.com/karamem0"
  },
  "description": {
    "short": "SampleApp short description",
    "full": "SampleApp full description"
  },
  "icons": {
    "outline": "outline.png",
    "color": "color.png"
  },
  "accentColor": "#FFFFFF",
  "staticTabs": [
    {
      "entityId": "3139441a-ef5c-475f-8779-6d50d57ca5dc",
      "name": "Home",
      "contentUrl": "https://github.com/karamem0",
      "websiteUrl": "https://github.com/karamem0",
      "scopes": [
        "personal"
      ]
    },
    {
      "entityId": "about",
      "scopes": [
        "personal"
      ]
    }
  ],
  "validDomains": [
    "github.com"
  ]
}