It is an error to call setState unless mounted is true. #26
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https://api.flutter.dev/flutter/widgets/State/mounted.html Got this error in my App, and checking "mounted" fixed it: NoSuchMethodError: NoSuchMethodError: The method 'markNeedsBuild' was called on null. Receiver: null Tried calling: markNeedsBuild() File "framework.dart", line 1253, in State.setState File "flutter_reorderable_list.dart", line 604, in _ReorderableItemState.update File "flutter_reorderable_list.dart", line 402, in _ReorderableListState.end File "<asynchronous suspension>" File "unparsed"
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https://api.flutter.dev/flutter/widgets/State/mounted.html
Got this error in my App, and checking "mounted" fixed it: