Database Security Rules

From the Firestore Database, Click on the Rules tab and copy and paste the following code below:

rules_version = '2';
service cloud.firestore {
  match /databases/{database}/documents {
    match /{document=**} {
      allow read, write; 
    }
  }
}

Click on Publish button to publish the security rules. That's it.

You should write your own security rules for the database