flutter chat ui cannot use in ubuntu20.04

[WebCoderT]

On my own ubuntu20.04, this library can't run, I keep reporting errors.
I followed the example provided.
But you will get the following error.
Of course I can't find the reason, so I hope someone can help me solve it.
Below is the error message

The following RenderObject was being processed when the exception was fired: RenderEditable#ebaac relayoutBoundary=up33 NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE:
                      creator: _Editable-[GlobalKey#0c1a2] ← Semantics ← CompositedTransformTarget ←
                        IgnorePointer-[GlobalKey#3814f] ← Semantics ← Listener ←
                        RawGestureDetector-[LabeledGlobalKey<RawGestureDetectorState>#e9173] ← Listener ← _ScrollableScope
                        ← RepaintBoundary ← CustomPaint-[GlobalKey#579da] ← _RawMouseRegion ← ⋯
                      parentData: <none> (can use size)
                      constraints: BoxConstraints(w=212.0, 8.0<=h<=Infinity)
                      size: Size(212.0, Infinity)
                      cursorColor: Color(0x002196f3)
                      showCursor: ValueNotifier<bool>#fea9c(true)
                      maxLines: 5
                      minLines: 1
                      selectionColor: null
                      textScaleFactor: 1.0
                      locale: zh
                      selection: TextSelection.invalid
                      offset: ScrollPositionWithSingleContext#386bc(offset: 0.0, range: null..null, viewport: null,
                        ScrollableState, ClampingScrollPhysics -> RangeMaintainingScrollPhysics, IdleScrollActivity#dcf9c,
                        ScrollDirection.idle)
                    This RenderObject had the following child:
                        text: TextSpan

[WebCoderT]

another error message

                    ══╡ EXCEPTION CAUGHT BY RENDERING LIBRARY ╞═════════════════════════════════════════════════════════
                    The following assertion was thrown during performLayout():
                    RenderEditable object was given an infinite size during layout.
                    This probably means that it is a render object that tries to be as big as possible, but it was put
                    inside another render object that allows its children to pick their own size.
                    The nearest ancestor providing an unbounded height constraint is: RenderFlex#d25a9 relayoutBoundary=up2
NEEDS-LAYOUT
                    NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE:
                      creator: Column ← ColoredBox ← Container ← Stack ← InheritedL10n ← InheritedChatTheme ←
                        InheritedUser ← Chat ← SizedBox ← _BodyBuilder ← MediaQuery ← LayoutId-[<_ScaffoldSlot.body>] ← ⋯
                      parentData: <none> (can use size)
                      constraints: BoxConstraints(0.0<=w<=300.0, 0.0<=h<=300.0)
                      size: MISSING
                      direction: vertical
                      mainAxisAlignment: start
                      mainAxisSize: max
                      crossAxisAlignment: center
                      verticalDirection: down
                    The constraints that applied to the RenderEditable were:
                      BoxConstraints(w=212.0, 8.0<=h<=Infinity)
                    The exact size it was given was:
                      Size(212.0, Infinity)
                    See https://flutter.dev/docs/development/ui/layout/box-constraints for more information.
                    
                    The relevant error-causing widget was:
                      TextField

TextField:file:///home/cylonix/%E4%B8%8B%E8%BD%BD/flutter_linux_2.5.3-stable/flutter/.pub-cache/hosted/pub.flutter-io.cn/
                      flutter_chat_ui-1.5.1/lib/src/widgets/input.dart:170:32
                    
                    When the exception was thrown, this was the stack:
                    #0      RenderBox.debugAssertDoesMeetConstraints.<anonymous closure>

[demchenkoalex]

Sorry to hear that. I cannot help unfortunately, because I don't have access to Ubuntu, and I never saw these errors on a mac