ScrollController not attached to any scroll views. 'package:flutter/src/widgets/scroll_controller.dart': Failed assertion: line 176 pos 12: '_positions.isNotEmpty' code example

Example: ScrollController not attached to any scroll views

flutter - ScrollController not attached to any scroll views
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  @override
  void initState() {
    super.initState();
 WidgetsBinding.instance.addPostFrameCallback((_){ 
    //code will run when widget rendering complete
  });
  }