Exception caught by widgets library:"Class 'String' has no instance method 'where'"

[lybgo]

Version: custom_radio_grouped_button: ^2.1.1 Flutter (Channel stable, 2.5.3, on Microsoft Windows [Version 10.0.19042.1288], locale zh-CN)

my code:

CustomCheckBoxGroup(
  buttonTextStyle: ButtonTextStyle(
    selectedColor: Colors.red,
    unSelectedColor: Colors.orange,
    textStyle: TextStyle(
      fontSize: 16,
    ),
  ),
  unSelectedColor: Theme.of(context).canvasColor,
  buttonLables: [
    "M",
    "T",
    "W",
    "T",
    "F",
    "S",
    "S",
  ],
  buttonValuesList: [
    "Monday",
    "Tuesday",
    "Wednesday",
    "Thursday",
    "Friday",
    "Saturday",
    "Sunday",
  ],
  checkBoxButtonValues: (values) {
    print(values);
  },
  spacing: 0,
  defaultSelected: "Monday",
  horizontal: false,
  enableButtonWrap: false,
  width: 40,
  absoluteZeroSpacing: false,
  selectedColor: Theme.of(context).accentColor,
  padding: 10, 
);

Exception:

======== Exception caught by widgets library =======================================================
The following NoSuchMethodError was thrown building _BodyBuilder:
Class 'String' has no instance method 'where'.
Receiver: "Monday"
Tried calling: where(Closure: (dynamic) => bool)

The relevant error-causing widget was: 
  Scaffold Scaffold:file:///E:/FlutterDev/YLAib/pages/device_pagee_time_switch/add_single_timeriew.dart:16:12
When the exception was thrown, this was the stack: 
#0      Object.noSuchMethod (dart:core-patch/object_patch.dart:63:5)
#1      _CustomCheckBoxGroupState.initState (package:custom_radio_grouped_button/CustomButtons/CustomCheckBoxGroup.dart:133:29)

[ketanchoyal]

Since it's a group button you need to pass List of defaultSelected so you should pass ["Monday"] instead of"Monday"

[lybgo]

@ketanchoyal thank you, According to your solution, the problem is solved. The code above is to directly use the code in your readme. It is recommended to modify the code in the readme.