Beta contract is missing for the app

I have got an error response when I have summit app for review. Any one face this issue please kindly help. Thank

{
    "errors": [
        {
            "id": "a9580e9f-103a-4a02-94c0-0a181df057df",
            "status": "422",
            "code": "ENTITY_UNPROCESSABLE.BETA_CONTRACT_MISSING",
            "title": "Beta contract is missing for the app.",
            "detail": "Beta Contract is missing."
        }
    ]
}