Unhandled Exception: type '_InternalLinkedHashMap' is not a subtype of type

How to resolve the error 

Unhandled Exception: type '_InternalLinkedHashMap<dynamic, dynamic>' is not a subtype of type

You may faced it when try to parse json data in Flutter 

var dataSnapShot = await _mDBRef.child(FireDBConstants.PATH_CATEGORY).once();
List<SubCategory> list = [];
dataSnapShot.value.forEach((key, value) {
  list.add(SubCategory.fromMap(Map<String, dynamic>.from(value)));
});

Above example is of Firebase Realtime Database response handle. The solution is 

Map<String, dynamic>.from(value)

If there is nested model use as below 

elements = ElementModel.fromMap(Map<String,dynamic>.from(json["elements"])),

Give it a try and let me know if you facing any issue.

Thanks