controller not working properly

[KaranChoudhary8]

controller.setItems()
controller.selectWhere()
controller.selectIndex()

i aim is to fetch select items from database store earlier ...

so i am using this methods but these are not working

error i get during controller.setItem() is:
The following assertion was thrown while dispatching notifications for
MultiSelectController:
Assertion failed:
file:///C:/Softwares/Flutter/flutter/packages/flutter/lib/src/widgets/overlay.dart:1582:12
SchedulerBinding.instance.schedulerPhase != SchedulerPhase.persistentCallbacks
is not true
MultiSelectController sending notification was:
MultiSelectController(options: [ValueItem(label: hero, value: Instance of 'MyModelClass', disabled: false, selected: true), ValueItem(label: employee, value: Instance of 'MyModelClass', disabled: false, selected: true)], open: false)

and in case of controller.selectWhere() and controller.selectIndex().... Nothing happens no error no nothing