title: How can I fix the error generated by the ListView?
body: <p>Guys I have a question for you:
  I have built a PageView. In this PageView is a ListView and in this ListView is a list of widgets.
  But unfortunately my code doesn't work for some reason ... And I have no idea why. I'm still very new to Flutter. I would really appreciate your help.
  The code that generates the error is the following:</p>
  
  <pre><code>Widget build(BuildContext context) {
      return Scaffold(
        backgroundColor: Colors.white,
        body: ListView(
          children: createHomePage(
              controller: _controller,
              content: widget.content,
              title: widget.title,
              menuButtonAction: widget.menuButton,
              showShadow: widget.showShadow,
              context: context),
        ),
      );
    }
  }
  </code></pre>
  
  <p>I would be really grateful if you could help me. The code works fine when I replace the ListView with a Colum, but then unfortunately I can't scroll ... But it has to be scrollable!
  I keep getting the following error:</p>
  
  <pre><code>I/flutter ( 4539): ══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════
  
  I/flutter ( 4539): The following assertion was thrown building NotificationListener&lt;KeepAliveNotification&gt;:
  
  I/flutter ( 4539): Incorrect use of ParentDataWidget.
  
  I/flutter ( 4539): Expanded widgets must be placed inside Flex widgets.
  
  I/flutter ( 4539): Expanded(no depth, flex: 1, dirty) has no Flex ancestor at all.
  
  I/flutter ( 4539): The ownership chain for the parent of the offending Expanded was:
  
  I/flutter ( 4539):   RepaintBoundary ← IndexedSemantics ← 
  NotificationListener&lt;KeepAliveNotification&gt; ← KeepAlive ←
  
  I/flutter ( 4539): AutomaticKeepAlive ← KeyedSubtree ← SliverList ← MediaQuery ← SliverPadding ← ShrinkWrappingViewport
  
  I/flutter ( 4539): ← ⋯
  
  I/flutter ( 4539): 
  
  I/flutter ( 4539): The relevant error-causing widget was:
  
  I/flutter ( 4539):   ListView
  </code></pre>
  
  <p><strong>How can I solve this problem? I've tried a lot. For example, I put the list of widgets in a column and changed the ListView to a SingleChildListView, but that didn't help either. However, I got another error message. This was:</strong></p>
  
  <pre><code>══╡ EXCEPTION CAUGHT BY RENDERING LIBRARY ╞═════════════════════════════════════════════════════════
  
  I/flutter ( 4539): The following assertion was thrown during performLayout():
  
  I/flutter ( 4539): RenderFlex children have non-zero flex but incoming height constraints are unbounded.
  
  I/flutter ( 4539): When a column is in a parent that does not provide a finite height constraint, for example if it is
  
  I/flutter ( 4539): in a vertical scrollable, it will try to shrink-wrap its children along the vertical axis. Setting a
  
  I/flutter ( 4539): flex on a child (e.g. using Expanded) indicates that the child is to expand to fill the remaining
  
  I/flutter ( 4539): space in the vertical direction.
  
  I/flutter ( 4539): These two directives are mutually exclusive. If a parent is to shrink-wrap its child, the child
  
  I/flutter ( 4539): cannot simultaneously expand to fit its parent.
  I/flutter ( 4539): Consider setting mainAxisSize to MainAxisSize.min and using FlexFit.loose fits for the flexible
  
  I/flutter ( 4539): children (using Flexible rather than Expanded). This will allow the flexible children to size
  
  I/flutter ( 4539): themselves to less than the infinite remaining space they would otherwise be forced to take, and
  
  I/flutter ( 4539): then will cause the RenderFlex to shrink-wrap the children rather than expanding to fit the maximum
  
  I/flutter ( 4539): constraints provided by the parent.
  
  I/flutter ( 4539): If this message did not help you determine the problem, consider using debugDumpRenderTree():
  
  I/flutter ( 4539):   https://flutter.dev/debugging/#rendering-layer
  
  I/flutter ( 4539):   http://api.flutter.dev/flutter/rendering/debugDumpRenderTree.html
  
  I/flutter ( 4539): The affected RenderFlex is:
  
  I/flutter ( 4539):   RenderFlex#bfee3 relayoutBoundary=up15 NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE(creator: Column ← RepaintBoundary ← IndexedSemantics ← NotificationListener&lt;KeepAliveNotification&gt; ← KeepAlive ← AutomaticKeepAlive ← KeyedSubtree ← SliverList ← MediaQuery ← SliverPadding ← ShrinkWrappingViewport ← IgnorePointer-[GlobalKey#665ae] ← ⋯, parentData: &lt;none&gt; (can use size), constraints: BoxConstraints(w=411.4, 0.0&lt;=h&lt;=Infinity), size: MISSING, direction: vertical, mainAxisAlignment: start, mainAxisSize: max, crossAxisAlignment: center, verticalDirection: down)
  
  I/flutter ( 4539): The creator information is set to:
  
  I/flutter ( 4539):   Column ← RepaintBoundary ← IndexedSemantics ← NotificationListener&lt;KeepAliveNotification&gt; ←
  
  I/flutter ( 4539):   KeepAlive ← AutomaticKeepAlive ← KeyedSubtree ← SliverList ← MediaQuery ← SliverPadding ←
  
  I/flutter ( 4539):   ShrinkWrappingViewport ← IgnorePointer-[GlobalKey#665ae] ← ⋯
  
  I/flutter ( 4539): See also: https://flutter.dev/layout/
  
  I/flutter ( 4539): If none of the above helps enough to fix this problem, please don't hesitate to file a bug:
  
  I/flutter ( 4539):   https://github.com/flutter/flutter/issues/new?template=BUG.md
  
  I/flutter ( 4539): 
  
  I/flutter ( 4539): The relevant error-causing widget was:
  
  I/flutter ( 4539):   Column
  </code></pre>
  
  <p><strong>In the second example, the screen turns white, but nothing happens and nothing works. At the first error the screen turns red and I get the error that you can see in the picture!</strong></p>
  
  <p><a href="https://i.stack.imgur.com/5bNWj.jpg" rel="nofollow noreferrer">Red Error on the Screen</a></p>