flutter getx rxlist in obx error show widget

Question

hi i am using getx on my project . I have RxList and i use Obx for shows my data :

RxList dasteBandi = [].obs;



void changeTodasteBandi(int index) {
dasteBandi.removeAt(index);

}

and widget is :

Obx(
  () => ListView.builder(
    // itemCount: catList.length,
    itemCount: taskController.dasteBandi.length,
    itemBuilder: (context, index) {
      return Container(
        decoration: BoxDecoration(
            color: themeController.isDark.value == true
                ? Colors.black.withOpacity(0.3)
                : Colors.white.withOpacity(0.8),
            borderRadius: BorderRadius.circular(16)),
        margin: EdgeInsets.symmetric(vertical: 1.h),
        child: ListTile(
          // title: Text(catList[index]),
          title: Text(taskController.dasteBandi[index]),

          leading: IconButton(
            onPressed: () {
              print(index);
              // setState(() {
              //   catList.removeAt(index);
              // });
              taskController.changeTodasteBandi(index);
            },
            icon: Icon(
              Icons.remove_circle_sharp,
              color: MyUtils.kRedColor,
            ),
          ),
        ),
      );
    },
  ),
);

when i use this widget i have this error :

Exception caught by widgets library Stack Overflow The relevant error-causing widget was GetMaterialApp

Stack Overflow The relevant error-causing widget was Obx

when i am remove this line itemCount: taskController.dasteBandi.length, and changed it with: itemCount: catList.length,

and use setState() every thing is fine but when i use getx controller for list i have that error