title: The relevant error-causing widget was Column
body: <p>the error says &quot;The relevant error-causing widget was Column&quot;, and i dont know how to solve that, can anyone have idea to solve this problem?</p>
  <p>this is my code:</p>
  <pre><code>  @override
    Widget build(BuildContext context) {
      // ignore: unused_local_variable
      // ignore: unused_local_variable
      final PreferredSizeWidget appBar = buildAppBar();
      // ignore: avoid_unnecessary_containers
      final tdListWidget = Container(
        child: ListTodo(todolist),
      );
      final pageBody = SafeArea(
        child: SingleChildScrollView(
          child: Column(
            children: &lt;Widget&gt;[
              ...buildPotraitContent(appBar, tdListWidget),
            ],
          ),
        ),
      );
      return MaterialApp(
        home: Builder(
          builder: (context) {
            return Scaffold(
              appBar: appBar,
              body: pageBody,
              floatingActionButtonLocation: FloatingActionButtonLocation.centerFloat,
              floatingActionButton: FloatingActionButton(
                child: const Icon(Icons.add),
                onPressed: () =&gt; startAddNewTodo(context),
              ),
            );
          }
        ),
      );
    }
  }
  </code></pre>