Unable to access rowy subtable data in flutter

[MohanaPriya-ABCD]

final response = await FirebaseFirestore.instance .collection('MF_Live_NFO_Fund_Details') .get() .then((value) => value.docs); debugPrint( 'mf home page ~ response ~ ${await response[0].reference.collection('fundDetails').get()}');
I have to implement rowy data in my flutter application, but I stuck in access sub table data.Like Main collection name 'MF_Live_NFO_Fund_Details' and inside I have subtables like 'fundDetails' . I tried to access this but its return 'permission denied' but permission was given to my main collection