Error: 7 PERMISSION_DENIED: Missing or insufficient permissions. code example

Example 1: Uncaught Error in onSnapshot: FirebaseError: Missing or insufficient permissions.

service cloud.firestore {
  match /databases/{database}/documents {
    match /{document=**} {
      allow read;
      allow write: if false;
    }
  }
}

Example 2: error: insufficient permissions for device

sudo adb start-server