[Flutter] type '_WithConverterDocumentSnapshot<PharmacyModel>' is not a subtype of type...

I am trying to convert a DocumentSnapshot into my own model called PharmacyModel. But when I tried that, I got this error 'type '_WithConverterDocumentSnapshot' is not a subtype of type 'DocumentSnapshot<Map<String, dynamic>>' in type cast'.

I am passing an argument of type of DocumentSnapshot to a page and take it as a DocumentSnapshot<Map<String, dynamic>>. Then I used fromSnapshot factory method to convert it into the PharmacyModel.

Here's how I passed the argument,

Navigator.pushNamed(context, '/pdf', arguments: {'pharmacy': pharmacyDoc});


Here's how I take it and convert it into the PharmacyModel,

final args = ModalRoute.of(context)!.settings.arguments as Map?;
if (args != null)
{
pharmacyDoc = args['pharmacy'] as DocumentSnapshot<Map<String, dynamic>>;
}


Here's my fromSnapshot factory method for PharmacyModel,

factory PharmacyModel.fromSnapshot(DocumentSnapshot<Map<String, dynamic>> document) {
if(document.data() != null) {
final data = document.data()!;
return PharmacyModel(
id: document.id,
name: data['Name'] as String? ?? '',
address: data['Address'] as String? ?? '',
contact: data['ContactNo'] as String? ?? '',
ratings: data['Ratings'] as double? ?? 0,
isDeliveryAvailable: data['DeliveryServiceAvailability'] as bool? ?? false,
deliveryRate: data['DeliveryRate'] as double? ?? 0.0,
operationHours: data['HoursOfOperation'] as String? ?? '',
position: geo.point(
latitude: (data['Position']['geopoint'] as GeoPoint).latitude,
longitude: (data['Position']['geopoint'] as GeoPoint).longitude,
),
tokens: List<String>.from(data['FCMTokens'] ?? []),
);
}
else {
return PharmacyModel.empty();
}
}

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