Error running in Flutter 2.0

[agrigera]

Getting this error message all the time woth Flutter 2.0.3
It works when running flutter in no-sound mode (flutter run --no-sound-null-safety) but even then the "title" is not recognized and I get the default "Select"

======== Exception caught by gesture ===============================================================
The following _TypeError was thrown while handling a gesture:
type 'List<String?>' is not a subtype of type 'List?' of 'value'

When the exception was thrown, this was the stack:
#0 FormFieldState.didChange (package:flutter/src/widgets/form.dart)
#1 __MultiSelectDialogFieldViewState._showDialog.. (package:multi_select_flutter/dialog/multi_select_dialog_field.dart:369:29)
#2 MultiSelectActions.onConfirmTap (package:multi_select_flutter/util/multi_select_actions.dart:27:16)
#3 _MultiSelectDialogState.build. (package:multi_select_flutter/dialog/mult_select_dialog.dart:300:20)
#4 _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:991:20)
...
Handler: "onTap"
Recognizer: TapGestureRecognizer#85693
debugOwner: GestureDetector
state: possible
won arena
finalPosition: Offset(288.0, 617.7)
finalLocalPosition: Offset(40.0, 19.7)
button: 1
sent tap down

[jameshmread]

Same issue here. Running on Flutter v2.2.0
When running with null safety I get the following error when confirming selections. When running with --no-sound-null-safety it runs as normal.

The following TypeErrorImpl was thrown while handling a gesture: Expected a value of type 'List<String>?', but got one of type 'List<String?>'

 MultiSelectDialogField(
                      initialValue: vals,
                      items: vals
                          .map((e) => MultiSelectItem(e, e))
                          .toList(),
                      onConfirm: (values) {
                        setState(() {
                          print(values);
    }
)

[baconbyte]

Same here running on 2.12.0, worked fine before upgrading project for null safety

List<DeviceType> testTypes = [
       DeviceType(name: "ABC", id: "123"),
       DeviceType(name: "XYZ", id: "456"),
  ];
......
MultiSelectDialogField(
                      title: Text("Device Types"),
                      items: testTypes.map((e) => MultiSelectItem(e, e.name)).toList(),
                      listType: MultiSelectListType.CHIP,
                      onConfirm: (values) {
                        _selectedDeviceTypes = values as List<DeviceType>;
                      },
                      buttonText: Text("Device Types"),
                    )

[tashfeenzaidi]

Getting same problem. when running on --no-sound-null-safety it is working as expected. Dont know how to solve this on null safety.
Flutter 2.4.0-1.0.pre.179 • channel master
======== Exception caught by gesture ===============================================================
The following _TypeError was thrown while handling a gesture:
type 'List<CountryState?>' is not a subtype of type 'List?' of 'value'

When the exception was thrown, this was the stack:
#0 FormFieldState.didChange (package:flutter/src/widgets/form.dart)
#1 __MultiSelectDialogFieldViewState._showDialog.. (package:multi_select_flutter/dialog/multi_select_dialog_field.dart:369:29)
#2 MultiSelectActions.onConfirmTap (package:multi_select_flutter/util/multi_select_actions.dart:27:16)
#3 _MultiSelectDialogState.build. (package:multi_select_flutter/dialog/mult_select_dialog.dart:300:20)
#4 _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:989:21)
#5 GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:193:24)
#6 TapGestureRecognizer.handleTapUp (package:flutter/src/gestures/tap.dart:608:11)
#7 BaseTapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:296:5)
#8 BaseTapGestureRecognizer.handlePrimaryPointer (package:flutter/src/gestures/tap.dart:230:7)
#9 PrimaryPointerGestureRecognizer.handleEvent (package:flutter/src/gestures/recognizer.dart:558:9)
#10 PointerRouter._dispatch (package:flutter/src/gestures/pointer_router.dart:94:12)
#11 PointerRouter._dispatchEventToRoutes. (package:flutter/src/gestures/pointer_router.dart:139:9)
#12 _LinkedHashMapMixin.forEach (dart:collection-patch/compact_hash.dart:400:8)
#13 PointerRouter._dispatchEventToRoutes (package:flutter/src/gestures/pointer_router.dart:137:18)
#14 PointerRouter.route (package:flutter/src/gestures/pointer_router.dart:123:7)
#15 GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:440:19)
#16 GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:420:22)
#17 RendererBinding.dispatchEvent (package:flutter/src/rendering/binding.dart:289:11)
#18 GestureBinding._handlePointerEventImmediately (package:flutter/src/gestures/binding.dart:374:7)
#19 GestureBinding.handlePointerEvent (package:flutter/src/gestures/binding.dart:338:5)
#20 GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:296:7)
#21 GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:279:7)
#25 _invoke1 (dart:ui/hooks.dart:183:10)
#26 PlatformDispatcher._dispatchPointerDataPacket (dart:ui/platform_dispatcher.dart:285:7)
#27 _dispatchPointerDataPacket (dart:ui/hooks.dart:96:31)
(elided 3 frames from dart:async)
Handler: "onTap"
Recognizer: TapGestureRecognizer#78d8c
debugOwner: GestureDetector
state: possible
won arena
finalPosition: Offset(297.0, 754.3)
finalLocalPosition: Offset(33.6, 18.8)
button: 1
sent tap down

[Fanom2813]

Hello guys, i have the same issue here is there a wayaround it ?

[tashfeenzaidi]

Hello guys, i have the same issue here is there a wayaround it ?

yes, I solved it by changing the plugin file. Are you getting the exact same error?

[Yacine-Benali]

Hello guys, i have the same issue here is there a wayaround it ?

yes, I solved it by changing the plugin file. Are you getting the exact same error?

am having the same error, what do you mean by changing the plugin file ?

[tashfeenzaidi]

I'm using MultiSelectBottomSheetField and if you check what this return you'll know why this error is coming. so i just go to its definition, it is returning this
return _MultiSelectBottomSheetFieldView<V>._withState(view as _MultiSelectBottomSheetFieldView<V>, state);
replace this with
return _MultiSelectBottomSheetFieldView<V?>._withState( view as _MultiSelectBottomSheetFieldView<V?>, state);
and this works for me. please check and let me know.

[agrigera]

It didn't helped that fixed, still getting original error. I'm using MultiSelectChipField. Found the same return to apply the same fix.

[arturjnt]

In my case I changed

MultiSelectDialogField(

into

MultiSelectDialogField<ROLES?>(

and it works.

Of course use whatever you need instead of ROLES.

Thanks @tashfeenzaidi