How to Obx in RxStatus.success() function

I use CheckboxListTile to input checkbox.

this is a function to retrieve a list of data from firestore

  void initDoctorCategory() {
    DoctorCategoryService().getListDoctorCategory().then((doctorCategory) {
      change(doctorCategory, status: RxStatus.success());
    });
  }

And this is my widget. i cant using obx for update value in doctorCategory[index].value:

body: controller.obx(
        (doctorCategory) => Container(
          child: ListView.builder(
            itemCount: doctorCategory!.length,
            itemBuilder: (BuildContext context, int index) {
              return Obx(() => CheckboxListTile(
                    title: Text(doctorCategory[index].categoryName!),
                    value: doctorCategory[index].value,
                    onChanged: (value) {
                      doctorCategory[index].value = value!;
                      // Get.back();
                    },
                  ));
            },
          ),
        ),
      ),

Im get the error:

[Get] the improper use of a GetX has been detected. You should only use GetX or Obx for the specific widget that will be updated. If you are seeing this error, you probably did not insert any observable variables into GetX/Obx or insert them outside the scope that GetX considers suitable for an update (example: GetX => HeavyWidget => variableObservable). If you need to update a parent widget and a child widget, wrap each one in an Obx/GetX. """

How to solved this? How to using Getx in RxStatus.success()?