selectRangeValues is not selecting a range of cells

[DktPhl2019]

Hello

I need to select a range of cells, but the code is not selecting any range.

After running the code, the cell A1 is selected, but the entire range of cells is not selected.

Could you please take a look.

Thank You

Here is the full code:

String myfile = 'C:/test/myfile.xlsx';
var bytes = File(myfile).readAsBytesSync();
      var excel = Excel.decodeBytes(bytes);
      Sheet sheetObj = excel['Sheet1'];
      var rowsMax = sheetObj.maxRows;
      var columnsMax = sheetObj.maxColumns;
      sheetObj.selectRangeValues(CellIndex.indexByColumnRow(columnIndex: 0,rowIndex: 0), end: CellIndex.indexByColumnRow(columnIndex: columnsMax, rowIndex: rowsMax));
      List<int>? fileBytes = excel.save();
      if (fileBytes != null) {
        File(join(myfile))
          ..createSync(recursive: true)
          ..writeAsBytesSync(fileBytes);
      }

[DktPhl2019]

Hello! Could you please reply. There is no response for one month. Thank You