Flutter: RenderBox düzenlenmedi

87

ListView oluşturmaya çalışıyorum ama list_form.dart sınıfını içe aktardığımda bu hatayı alıyorum. Belki düzende bazı hatalar yaptım çünkü ana dosyanın içinde çalıştırmaya çalışırsam bu hatayı alamıyorum.

Bu hata:

    I/flutter (12956): ══╡ EXCEPTION CAUGHT BY RENDERING LIBRARY ╞═════════════════════════════════════════════════════════
I/flutter (12956): The following assertion was thrown during performResize():
I/flutter (12956): Vertical viewport was given unbounded height.
I/flutter (12956): Viewports expand in the scrolling direction to fill their container.In this case, a vertical
I/flutter (12956): viewport was given an unlimited amount of vertical space in which to expand. This situation
I/flutter (12956): typically happens when a scrollable widget is nested inside another scrollable widget.
I/flutter (12956): If this widget is always nested in a scrollable widget there is no need to use a viewport because
I/flutter (12956): there will always be enough vertical space for the children. In this case, consider using a Column
I/flutter (12956): instead. Otherwise, consider using the "shrinkWrap" property (or a ShrinkWrappingViewport) to size
I/flutter (12956): the height of the viewport to the sum of the heights of its children.
I/flutter (12956):
I/flutter (12956): When the exception was thrown, this was the stack:
I/flutter (12956): #0      RenderViewport.performResize.<anonymous closure> (package:flutter/src/rendering/viewport.dart:1133:15)
I/flutter (12956): #1      RenderViewport.performResize (package:flutter/src/rendering/viewport.dart:1186:6)
I/flutter (12956): #2      RenderObject.layout (package:flutter/src/rendering/object.dart:1616:9)
I/flutter (12956): #3      _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:108:13)
I/flutter (12956): #4      RenderObject.layout (package:flutter/src/rendering/object.dart:1631:7)
I/flutter (12956): #5      _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:108:13)
I/flutter (12956): #6      RenderObject.layout (package:flutter/src/rendering/object.dart:1631:7)
I/flutter (12956): #7      _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:108:13)
I/flutter (12956): #8      RenderObject.layout (package:flutter/src/rendering/object.dart:1631:7)
I/flutter (12956): #9      _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:108:13)
I/flutter (12956): #10     RenderObject.layout (package:flutter/src/rendering/object.dart:1631:7)
I/flutter (12956): #11     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:108:13)
I/flutter (12956): #12     RenderObject.layout (package:flutter/src/rendering/object.dart:1631:7)
I/flutter (12956): #13     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:108:13)
I/flutter (12956): #14     RenderObject.layout (package:flutter/src/rendering/object.dart:1631:7)
I/flutter (12956): #15     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:108:13)
I/flutter (12956): #16     RenderObject.layout (package:flutter/src/rendering/object.dart:1631:7)
I/flutter (12956): #17     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:108:13)
I/flutter (12956): #18     RenderObject.layout (package:flutter/src/rendering/object.dart:1631:7)
I/flutter (12956): #19     RenderFlex.performLayout (package:flutter/src/rendering/flex.dart:738:15)
I/flutter (12956): #20     RenderObject.layout (package:flutter/src/rendering/object.dart:1631:7)
I/flutter (12956): #21     RenderFlex.performLayout (package:flutter/src/rendering/flex.dart:738:15)
I/flutter (12956): #22     RenderObject.layout (package:flutter/src/rendering/object.dart:1631:7)
I/flutter (12956): #23     RenderPositionedBox.performLayout (package:flutter/src/rendering/shifted_box.dart:381:13)
I/flutter (12956): #24     RenderObject.layout (package:flutter/src/rendering/object.dart:1631:7)
I/flutter (12956): #25     MultiChildLayoutDelegate.layoutChild (package:flutter/src/rendering/custom_layout.dart:141:11)
I/flutter (12956): #26     _ScaffoldLayout.performLayout (package:flutter/src/material/scaffold.dart:339:7)
I/flutter (12956): #27     MultiChildLayoutDelegate._callPerformLayout (package:flutter/src/rendering/custom_layout.dart:211:7)
I/flutter (12956): #28     RenderCustomMultiChildLayoutBox.performLayout (package:flutter/src/rendering/custom_layout.dart:355:14)
I/flutter (12956): #29     RenderObject.layout (package:flutter/src/rendering/object.dart:1631:7)
I/flutter (12956): #30     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:108:13)
I/flutter (12956): #31     RenderObject.layout (package:flutter/src/rendering/object.dart:1631:7)
I/flutter (12956): #32     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:108:13)
I/flutter (12956): #33     _RenderCustomClip.performLayout (package:flutter/src/rendering/proxy_box.dart:1192:11)
I/flutter (12956): #34     RenderObject.layout (package:flutter/src/rendering/object.dart:1631:7)
I/flutter (12956): #35     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:108:13)
I/flutter (12956): #36     RenderObject.layout (package:flutter/src/rendering/object.dart:1631:7)
I/flutter (12956): #37     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:108:13)
I/flutter (12956): #38     _RenderCustomClip.performLayout (package:flutter/src/rendering/proxy_box.dart:1192:11)
I/flutter (12956): #39     RenderObject.layout (package:flutter/src/rendering/object.dart:1631:7)
I/flutter (12956): #40     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:108:13)
I/flutter (12956): #41     RenderObject.layout (package:flutter/src/rendering/object.dart:1631:7)
I/flutter (12956): #42     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:108:13)
I/flutter (12956): #43     RenderObject.layout (package:flutter/src/rendering/object.dart:1631:7)
I/flutter (12956): #44     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:108:13)
I/flutter (12956): #45     RenderObject.layout (package:flutter/src/rendering/object.dart:1631:7)
I/flutter (12956): #46     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:108:13)
I/flutter (12956): #47     RenderObject.layout (package:flutter/src/rendering/object.dart:1631:7)
I/flutter (12956): #48     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:108:13)
I/flutter (12956): #49     RenderObject.layout (package:flutter/src/rendering/object.dart:1631:7)
I/flutter (12956): #50     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:108:13)
I/flutter (12956): #51     RenderObject.layout (package:flutter/src/rendering/object.dart:1631:7)
I/flutter (12956): #52     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:108:13)
I/flutter (12956): #53     RenderObject.layout (package:flutter/src/rendering/object.dart:1631:7)
I/flutter (12956): #54     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:108:13)
I/flutter (12956): #55     RenderOffstage.performLayout (package:flutter/src/rendering/proxy_box.dart:2884:13)
I/flutter (12956): #56     RenderObject.layout (package:flutter/src/rendering/object.dart:1631:7)
I/flutter (12956): #57     RenderStack.performLayout (package:flutter/src/rendering/stack.dart:520:15)
I/flutter (12956): #58     RenderObject.layout (package:flutter/src/rendering/object.dart:1631:7)
I/flutter (12956): #59     __RenderTheatre&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:108:13)
I/flutter (12956): #60     RenderObject.layout (package:flutter/src/rendering/object.dart:1631:7)
I/flutter (12956): #61     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:108:13)
I/flutter (12956): #62     RenderObject.layout (package:flutter/src/rendering/object.dart:1631:7)
I/flutter (12956): #63     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:108:13)
I/flutter (12956): #64     RenderObject.layout (package:flutter/src/rendering/object.dart:1631:7)
I/flutter (12956): #65     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:108:13)
I/flutter (12956): #66     RenderObject.layout (package:flutter/src/rendering/object.dart:1631:7)
I/flutter (12956): #67     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:108:13)
I/flutter (12956): #68     RenderObject.layout (package:flutter/src/rendering/object.dart:1631:7)
I/flutter (12956): #69     _RenderProxyBox&RenderBox&RenderObjectWithChildMixin&RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:108:13)
I/flutter (12956): #70     RenderObject.layout (package:flutter/src/rendering/object.dart:1631:7)
I/flutter (12956): #71     RenderView.performLayout (package:flutter/src/rendering/view.dart:147:13)
I/flutter (12956): #72     RenderObject._layoutWithoutResize (package:flutter/src/rendering/object.dart:1506:7)
I/flutter (12956): #73     PipelineOwner.flushLayout (package:flutter/src/rendering/object.dart:765:18)
I/flutter (12956): #74     _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&SemanticsBinding&RendererBinding.drawFrame (package:flutter/src/rendering/binding.dart:270:19)
I/flutter (12956): #75     _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&SemanticsBinding&RendererBinding&WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:674:13)
I/flutter (12956): #76     _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&SemanticsBinding&RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:208:5)
I/flutter (12956): #77     _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:990:15)
I/flutter (12956): #78     _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:930:9)
I/flutter (12956): #79     _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding.scheduleWarmUpFrame.<anonymous closure> (package:flutter/src/scheduler/binding.dart:751:7)
I/flutter (12956): #81     _Timer._runTimers (dart:isolate/runtime/libtimer_impl.dart:382:19)
I/flutter (12956): #82     _Timer._handleMessage (dart:isolate/runtime/libtimer_impl.dart:416:5)
I/flutter (12956): #83     _RawReceivePortImpl._handleMessage (dart:isolate/runtime/libisolate_patch.dart:171:12)
I/flutter (12956): (elided one frame from package dart:async)
I/flutter (12956):
I/flutter (12956): The following RenderObject was being processed when the exception was fired:
I/flutter (12956):   RenderViewport#925a8 NEEDS-LAYOUT NEEDS-PAINT
I/flutter (12956):   creator: Viewport ← _ScrollableScope ← IgnorePointer-[GlobalKey#8e8f7] ← Semantics ← Listener ←
I/flutter (12956):   _GestureSemantics ← RawGestureDetector-[LabeledGlobalKey<RawGestureDetectorState>#67ae5] ←
I/flutter (12956):   _ScrollSemantics-[GlobalKey#17eb8] ← RepaintBoundary ← CustomPaint ← RepaintBoundary ←
I/flutter (12956):   NotificationListener<ScrollNotification> ← ⋯
I/flutter (12956):   parentData: <none> (can use size)
I/flutter (12956):   constraints: BoxConstraints(unconstrained)
I/flutter (12956):   size: MISSING
I/flutter (12956):   axisDirection: down
I/flutter (12956):   crossAxisDirection: right
I/flutter (12956):   offset: ScrollPositionWithSingleContext#c4917(offset: 0.0, range: null..null, viewport: null,
I/flutter (12956):   ScrollableState, AlwaysScrollableScrollPhysics -> ClampingScrollPhysics, IdleScrollActivity#2fecf,
I/flutter (12956):   ScrollDirection.idle)
I/flutter (12956):   anchor: 0.0
I/flutter (12956): This RenderObject had the following descendants (showing up to depth 5):
I/flutter (12956):   RenderSliverPadding#74d62 NEEDS-LAYOUT NEEDS-PAINT
I/flutter (12956):     RenderSliverList#5c56d NEEDS-LAYOUT NEEDS-PAINT
I/flutter (12956): ════════════════════════════════════════════════════════════════════════════════════════════════════
I/flutter (12956): Another exception was thrown: RenderBox was not laid out: RenderViewport#925a8 NEEDS-LAYOUT NEEDS-PAINT
I/flutter (12956): Another exception was thrown: RenderBox was not laid out: RenderViewport#925a8 NEEDS-PAINT
I/flutter (12956): Another exception was thrown: RenderBox was not laid out: RenderIgnorePointer#8bbda relayoutBoundary=up11 NEEDS-PAINT
I/flutter (12956): Another exception was thrown: RenderBox was not laid out: RenderSemanticsAnnotations#209b4 relayoutBoundary=up10 NEEDS-PAINT
I/flutter (12956): Another exception was thrown: RenderBox was not laid out: RenderPointerListener#a9641 relayoutBoundary=up9 NEEDS-PAINT
I/flutter (12956): Another exception was thrown: RenderBox was not laid out: RenderSemanticsGestureHandler#9f5b4 relayoutBoundary=up8 NEEDS-PAINT
I/flutter (12956): Another exception was thrown: RenderBox was not laid out: _RenderScrollSemantics#47944 relayoutBoundary=up7 NEEDS-PAINT
I/flutter (12956): Another exception was thrown: RenderBox was not laid out: RenderRepaintBoundary#e17a8 relayoutBoundary=up6 NEEDS-PAINT
I/flutter (12956): Another exception was thrown: RenderBox was not laid out: RenderCustomPaint#a2328 relayoutBoundary=up5 NEEDS-PAINT
I/flutter (12956): Another exception was thrown: RenderBox was not laid out: RenderRepaintBoundary#02607 relayoutBoundary=up4 NEEDS-PAINT
I/flutter (12956): Another exception was thrown: RenderBox was not laid out: RenderFlex#79164 relayoutBoundary=up3 NEEDS-PAINT
I/flutter (12956): Another exception was thrown: 'package:flutter/src/rendering/shifted_box.dart': Failed assertion: line 310 pos 12: 'child.hasSize': is not true.
I/flutter (12956): Another exception was thrown: NoSuchMethodError: The method '<=' was called on null.

Bu list_form.dart sınıfıdır:

import 'package:flutter/material.dart';

class ListForm extends StatefulWidget {
  @override
  ListFormState createState() => new ListFormState();
}

class ListFormState extends State<ListForm> {
    List<String> products = ["Test1", "Test2", "Test3"];
    @override
    Widget build(BuildContext context) {
      return new Container(
        child: new Center(
          child: new Column(
            children: <Widget>[
              new Row(
                children: <Widget>[
                  new ListView.builder(
                    itemCount: products.length,
                    itemBuilder: (BuildContext ctxt, int index) {
                      return new Text(products[index]);
                    }
                  ),
                  new IconButton(
                    icon: Icon(Icons.remove_circle),
                    onPressed: () { },
                  )
                ],
                mainAxisAlignment: MainAxisAlignment.spaceBetween,
              ),
              new TextField(
                decoration: new InputDecoration(
                  hintText: "Prodotto"
                ),
                onSubmitted: (String str) {
                  setState(() {
                    products.add(str);
                  });
                },
              ),
            ]
          )
        )
      );
    }
}

Bu, app_base.dart sınıfıdır:

import 'package:flutter/material.dart';
import '../UI/list_form.dart';

class AppBase extends StatefulWidget {
  @override
  State createState() => new AppBaseState();
}

class AppBaseState extends State<AppBase> {
  bool _pressed = true;

  @override
  Widget build(BuildContext context) {
    return new Material(
      color: Colors.greenAccent,
      child: new Scaffold(
        body:
          new ListForm(),
        appBar: AppBar(
          centerTitle: true,
          title: const Text('Skeeper'),
          backgroundColor: Colors.green,
        ),
        floatingActionButton: FloatingActionButton(
          tooltip: 'Test',
          child: new Icon(Icons.add),
          backgroundColor: Colors.green,
          onPressed: () {
              setState(() {
                _pressed = !_pressed;
              });
          },
        ),
      )
    );
  }
}

Kullanılmayan bir kod varsa endişelenmeyin, bu devam eden bir çalışma ve bu hata yaptığım şeye devam etmeme engel oldu.

dart  flutter  flutter-layout 
— Alessandro Bertozzi
kaynak

Yanıtlar:

161

Sorun, ListViewbir Sütun / Satırın içine yerleştiriyor olmanızdır . İstisnadaki metin, hatanın iyi bir açıklamasını verir.

Hatayı önlemek için ListViewiçeriye bir boyut sağlamanız gerekir .

Size Expanded, yatay boyutu (maksimum mevcut) ve SizedBox(Bir Konteyner Olabilir ) bilgisini bildirmek için bir kullananheight:

    new Row(
      children: <Widget>[
        Expanded(
          child: SizedBox(
            height: 200.0,
            child: new ListView.builder(
              scrollDirection: Axis.horizontal,
              itemCount: products.length,
              itemBuilder: (BuildContext ctxt, int index) {
                return new Text(products[index]);
              },
            ),
          ),
        ),
        new IconButton(
          icon: Icon(Icons.remove_circle),
          onPressed: () {},
        ),
      ],
      mainAxisAlignment: MainAxisAlignment.spaceBetween,
    )

,

— kemamolinler
kaynak
1
Kök olarak "Satır" yerine "Sütun" kullanıyordum. "Satır" olarak değiştirdikten sonra hata düzeltildi. Yardım için teşekkürler.
— ABHIMANGAL MS
91

Bunun gibi bir kod ekleyebilirsiniz 

ListView.builder{
   shrinkWrap: true,
}
— muazharin alfan
kaynak
Biri bana bunu bir şablonda nasıl kullanacağım konusunda rehberlik edebilir mi?
— Kavinda Jayakody
2
shrinkWrap benim için işe yaramadı, bana uygun olan @chemamolins çözümünü kullandım.
— Kamlesh
1
Bu, uzun listeler için kötü bir çözümdür. Belgelerden : "Kaydırma görünümünün içeriğini küçültmek, izin verilen maksimum boyuta genişletmekten önemli ölçüde daha pahalıdır, çünkü içerik kaydırma sırasında genişleyebilir ve daralabilir; bu, kaydırma konumu her değiştiğinde kaydırma görünümünün boyutunun yeniden hesaplanması gerektiği anlamına gelir ".
— boldnik
30

Hatanın nedeni:

Columndikey eksende genişlemeye çalışır ListView, bu yüzden de genişler , dolayısıyla yüksekliğini sınırlamanız gerekir ListView.

Çözümler

  1. İçinde tüm sol alanı kaplamak istiyorsanız, ya Expandedda kullanın .FlexibleListViewColumn

    Column(
  children: <Widget>[
    Expanded(
      child: ListView(...),
    )
  ],
)

  1. SizedBoxBoyutunu ListViewbelirli bir yükseklikle sınırlamak istiyorsanız kullanın .

    Column(
  children: <Widget>[
    SizedBox(
      height: 200, // constrain height
      child: ListView(),
    )
  ],
)

  1. Çok büyük shrinkWrapdeğilse kullanın ListView.

    Column(
  children: <Widget>[
    ListView(
      shrinkWrap: true, // use it
    )
  ],
)
— CopsOnRoad
kaynak
Teşekkür ederim! Bu açık ara en iyi ve özlü cevaptır! Merak ediyorum, neden aynı Columnsarma bileşimine sahip durumumda a ListViewkullanırsam bir hata alıyorum Expandedama SizedBoxyine de iyi çalışıyor 🤔
— boldnik
@boldnik Sizdeki diğer widget'lar nelerdir, Columnbunu bir soru olarak sorabilir veya yorum bölümünde ele alınabileceğini düşünmeniz durumunda benimle sohbet üzerinden bir konuşma başlatabilirsiniz.
— CopsOnRoad
3

ben

Bu kodu, yatay listedeki öğeleri görüntüleme sorununu çözmek için kullandım.

new Container(
      height: 20,
      child: Row(
        mainAxisAlignment: MainAxisAlignment.end,
        children: <Widget>[
          ListView.builder(
            scrollDirection: Axis.horizontal,
            shrinkWrap: true,
            itemCount: array.length,
            itemBuilder: (context, index){
              return array[index];
            },
          ),
        ],
      ),
    );
— mohammad byervand
kaynak
3

Liste görünümünüzü Esnek bir widget'a yerleştirmek de yardımcı olabilir,

Flexible( fit: FlexFit.tight, child: _buildYourListWidget(..),)
— anahtarım
kaynak
1

ListView'unuzu Genişletilmiş bir widget'a sarın

 Expanded(child:MyListView())
— MobileMon
kaynak
2
eğer Expandedçocuk aColumn
— boldnik
0

Benzer bir problemim vardı, ama benim durumumda Listview'in başında bir sıraya girdim ve elbette tüm alanı tüketiyordu. Row'u liderden çıkarmak zorunda kaldım ve çözüldü. Sorunun, kapsayıcısının sahip olabileceğinden daha büyük bir widget olup olmadığını kontrol etmenizi tavsiye ederim.

— Ricardo Silveira
kaynak
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