The ownership chain for the RenderObject that received the incompatible parent data in Flutter-CodePudding

An error occurred saying Incorrect use of ParentDataWidget when I use the Expanded widget as follows, What I did do wrong here? As well, what is the ownership chain meaning?

Code is as follows,

 Expanded(
        child: Wrap(
          alignment: WrapAlignment.spaceAround,
          children: <Widget>[
            Expanded(
              child: Row(
                crossAxisAlignment: CrossAxisAlignment.center,
                verticalDirection: VerticalDirection.down,
                children: <Widget>[
                  Text(
                      "${Constants.ASSIGNMENT_PREFIX} ${assignment?.id}",
                      style: Theme.of(context)
                          .textTheme
                          .headline6),
                  _getAssignState(
                      assignment?.status),
                ],
              ),
            ),
          ],
        ),
      )

Full Error as follows,

======== Exception caught by widgets library =======================================================
The following assertion was thrown while applying parent data.:
Incorrect use of ParentDataWidget.

The ParentDataWidget Expanded(flex: 1) wants to apply ParentData of type FlexParentData to a RenderObject, which has been set up to accept ParentData of incompatible type WrapParentData.

Usually, this means that the Expanded widget has the wrong ancestor RenderObjectWidget. Typically, Expanded widgets are placed directly inside Flex widgets.
The offending Expanded is currently placed inside a Wrap widget.

The ownership chain for the RenderObject that received the incompatible parent data was:
  Row ← Expanded ← Wrap ← Expanded ← Row ← Padding ← Padding ← DecoratedBox ← Container ← Listener ← ⋯
When the exception was thrown, this was the stack: 
#0      RenderObjectElement._updateParentData.<anonymous closure> (package:flutter/src/widgets/framework.dart:5723:11)
#1      RenderObjectElement._updateParentData (package:flutter/src/widgets/framework.dart:5739:6)
#2      RenderObjectElement.attachRenderObject (package:flutter/src/widgets/framework.dart:5761:7)
#3      RenderObjectElement.mount (package:flutter/src/widgets/framework.dart:5440:5)
#4      MultiChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:6228:11)
...
====================================================================================================
Reloaded 1 of 2005 libraries in 1,286ms.

CodePudding user response：

you can only use Expanded as a child of Column and Row or FLex widget.

Expanded: A widget that expands a child of a Row, Column, or Flex so that the child fills the available space.

child: Wrap(
  alignment: WrapAlignment.spaceAround,
  children: <Widget>[
    // Expanded(   => remove this
       Row()