Incorrect use of ParentDataWidget Flutter / Dart Origin: On your device OSI layer 7 · Application Last updated 4 Nov 2026

Flutter: Incorrect use of ParentDataWidget. The ParentDataWidget Expanded(flex: 1) wants to apply ParentData of type FlexParentData to a RenderObject

A widget like Expanded, Flexible, Positioned or TableCell was placed under a parent that does not support it.

Exact message you may see Incorrect use of ParentDataWidgetThe ParentDataWidget Expanded wants to apply ParentData of type FlexParentDataThe ParentDataWidget Positioned wants to apply StackParentDataTypically, Expanded widgets are placed directly inside Flex widgetsParentDataWidget incorrect use
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Seen on: Flutter

Meaning

These widgets must be a direct child of a specific parent: Expanded/Flexible of Row/Column/Flex, Positioned of Stack, TableCell of TableRow. Extra wrappers such as Padding or Container between them break the relationship. Move the widget directly under the right parent.

Common causes

  • Expanded inside a Container, Padding or SizedBox instead of directly under a Row/Column
  • Positioned used outside a Stack
  • Expanded inside a ListView or Stack
  • Widget wrapper inserted between Expanded and Row
  • TableCell outside TableRow

⚡ Quick fix

  1. Make Expanded/Flexible a direct child of Row/Column/Flex
  2. Put Positioned directly inside Stack
  3. Move wrappers (Padding, Center) inside the Expanded

Detailed fix by platform

Flutter

  1. Fix pattern: Row(children: [Expanded(child: Padding(padding: EdgeInsets.all(8), child: Text('x')))])

How to diagnose

  1. Widget — Expanded, Positioned or TableCell?
  2. Parent — Correct direct parent?
  3. Wrapper — Anything in between?

🔧 Still not fixed?

Many errors look alike. If the steps above didn’t solve it, one of these is probably what you’re facing:

Where this error sits

Origin: On your device. Errors that are often confused with or caused by this one (click to open):

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