Goto Firebase Console and select your project on which your Foodomaa application works.
Select Realtime Database
Goto Rules tab.
Remove everything and paste the following:
{
"rules": {
".read": "auth == null",
".write": "auth == null"
}
}
Publish the changes.
Goto this link: https://console.firebase.google.com/u/0/subscriptions/overview
Select your project again and disable email for Firebase insecure rules and expiring rules.
Done.
(There is no need to worry about this email, but please make sure the rules are set as described above)