Unhandled Exception

[McSam94]

I getting this error Unhandled Exception: 'package:date_range_picker/date_range_picker.dart': Failed assertion: line 1280 pos 10: '!initialLastDate.isAfter(lastDate)': initialDate must be on or before lastDate and the dialog won't show up. Any help would appreciated. 🙏
This is my code :

Future<List<DateTime>> _showDateRangePicker() async {
    final List<DateTime> pickedDateRange = await DateRangePicker.showDatePicker(
      context: context,
      initialFirstDate: new DateTime(2020, 1, 1),
      initialLastDate: new DateTime(2020, 4, 1),
      firstDate: new DateTime(2015),
      lastDate: new DateTime(2020)
    );

    if(pickedDateRange == null && pickedDateRange.length < 2) {
      return [];
    }

    return pickedDateRange;
  }

[antonio555]

Hi @McSam94,
I had the same error ,
the problem is between initialFirstDate & lastDate

when you initiate the lastSAte like this: new DateTime(2020), you'll have the same date as the initialFirstDate I think so that's why it caught that exception:

Try to change the lastDate like this
lastDate: (new DateTime.now()).add(new Duration(days: 7))

[arutkayb]

I think the problem is caused by lastDate: new DateTime(2020) is not greater than initialLastDate: new DateTime(2020, 4, 1)

[etienneyoufeel]

@arutkayb true