Android Question [Firestore lib] CollectionReference is not inited

Dim users As CollectionReference = fs.collection2("users")
users.limit(10).fetch("UserFetch")

Sub Activity_Create(FirstTime As Boolean)
    'Do not forget to load the layout file created with the visual designer. For example:
    'Activity.LoadLayout("Layout1")

    fs.Initialize("Firestore",True)
    'Log(fs.FirestoreSettings)    'FirebaseFirestoreSettings{host=firestore.googleapis.com, sslEnabled=true, persistenceEnabled=true, timestampsInSnapshotsEnabled=true}
    Dim users As CollectionReference = fs.collection2("users")
    If users <> Null Then
        Log("Setting query to get Users")
        users.limit(10).fetch("UserFetch")
        Wait for UserFetch_Snapshot(success As Boolean, snap As QuerySnapshot, info As String)
        Log($"User_Snapshot(${snap.Size},${snap})"$)
        Log(snap.Metadata)
        Dim documents As List = snap.Documents
        Log(documents)
        If documents.IsInitialized Then
            If documents.Size > 0 Then
                For i = 0 To documents.Size-1
                    Dim docsnap As DocumentSnapshot = documents.Get(i)
                    Log("Query4DonManfred DocumentNo: #"&i&": "&docsnap.Id)
                Next
            End If
        Else
            Log("Snapshot does not contain a list of Documents...")
        End If
    End If

End Sub

    fs.Initialize("Firestore",True)
    Dim users As CollectionReference = fs.collection("Users","UserCollection")
    If users <> Null Then
        Log("Setting query to get Users")
        'driver.whereEqualTo("id","DonManfred").limit(1).fetch("DriverFetch")
        users.setEventname("UserWatch","Userlist")
        'users.addSnapshotListener
        users.orderBy("Username").limit(25).fetch("UserWatch")
        wait for UserWatch_Snapshot(success As Boolean, snap As QuerySnapshot, info As String)
        Log($"UserWatch_Snapshot(${success},${snap.Size},${snap})"$)
        Dim meta As SnapshotMetadata = snap.Metadata
        Dim documents As List = snap.Documents
        'Log(documents)
        If documents.IsInitialized Then
            If documents.Size > 0 Then
                For i = 0 To documents.Size-1
                    Dim docsnap As DocumentSnapshot = documents.Get(i)
                    Log("Query DocumentNo: #"&i&": "&docsnap.Id)
                    Dim data As Map = docsnap.Data
                    Log(data)
                Next
            End If
        End If
    Else
        Log("Snapshot does not contain a list of Documents...")
    End If

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

service cloud.firestore {
  match /databases/{database}/documents {
    match /{document=**} {
      allow read, write;
    }
  }
  match /databases/{database}/Drivers {
    match /{document=**} {
      allow read, write;
    }
  }
  match /databases/{database}/Cars {
    match /{document=**} {
      allow read, write;
    }
  }
  match /databases/{database}/Pets {
    match /{document=**} {
      allow read, write;
    }
  }
 match /databases/{database}/Users {
    match /{document=**} {
      allow read, write;
    }
  }
}

UserWatch_Snapshot(true,0,com.google.firebase.firestore.QuerySnapshot@f3e820bf)

users.orderBy("Username").limit(25).fetch("UserWatch")

users.limit(25).fetch("UserWatch")

Dim users As CollectionReference = fs.collection("users","UserCollection")

service cloud.firestore {
 match /databases/{database}/users {
    match /{document=**} {
      allow read, write;
    }
  }
}

service cloud.firestore {
 match /databases/{database}/users {
    match /{document=**} {
      allow read, write;
    }
  }
}

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