Widget _chart(){
    return SfCartesianChart(
        primaryXAxis: CategoryAxis(),
        primaryYAxis: NumericAxis(minimum: 0, maximum: 40, interval: 10),
        tooltipBehavior: TooltipBehavior(enable: true),
        series: <ChartSeries<_ChartData, String>>[
          DoughnutSeries<_ChartData, String>(
            startAngle: 0,
            endAngle: 180,
            dataSource: [
              _ChartData('CHN', 12),
              _ChartData('GER', 15),
              _ChartData('RUS', 30),
              _ChartData('BRZ', 6.4),
              _ChartData('IND', 14)
            ],
            xValueMapper: (_ChartData data, _) => data.x,
            yValueMapper: (_ChartData data, _) => data.y,
            name: 'Gold',
          ),
        ],
    );
  }

======== Exception caught by widgets library =======================================================
The following _TypeError was thrown building Container:
type 'DoughnutSeriesRendererExtension' is not a subtype of type 'CartesianSeriesRenderer'

The relevant error-causing widget was: 
  Container Container:file:///C:/Repositoris/hub%20OS/hub_buildings/lib/views/projects/v_project_floors.dart:76:13
When the exception was thrown, this was the stack: 
#0      SfCartesianChartState._createAndUpdateSeriesRenderer (package:syncfusion_flutter_charts/src/chart/base/chart_base.dart:1626:11)
#1      SfCartesianChartState.initState (package:syncfusion_flutter_charts/src/chart/base/chart_base.dart:1331:5)
#2      StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4942:57)
#3      ComponentElement.mount (package:flutter/src/widgets/framework.dart:4781:5)
#4      Element.inflateWidget (package:flutter/src/widgets/framework.dart:3817:16)
#5      Element.updateChild (package:flutter/src/widgets/framework.dart:3545:20)
#6      ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4832:16)
#7      Element.rebuild (package:flutter/src/widgets/framework.dart:4529:5)
#8      StatelessElement.update (package:flutter/src/widgets/framework.dart:4883:5)
#9      Element.updateChild (package:flutter/src/widgets/framework.dart:3530:15)
#10     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4832:16)
#11     StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4977:11)
#12     Element.rebuild (package:flutter/src/widgets/framework.dart:4529:5)
#13     StatefulElement.update (package:flutter/src/widgets/framework.dart:5009:5)
#14     Element.updateChild (package:flutter/src/widgets/framework.dart:3530:15)
#15     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4832:16)
#16     Element.rebuild (package:flutter/src/widgets/framework.dart:4529:5)
#17     StatelessElement.update (package:flutter/src/widgets/framework.dart:4883:5)
#18     Element.updateChild (package:flutter/src/widgets/framework.dart:3530:15)
#19     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4832:16)
#20     Element.rebuild (package:flutter/src/widgets/framework.dart:4529:5)
#21     ProxyElement.update (package:flutter/src/widgets/framework.dart:5154:5)
#22     Element.updateChild (package:flutter/src/widgets/framework.dart:3530:15)
#23     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4832:16)
#24     Element.rebuild (package:flutter/src/widgets/framework.dart:4529:5)
#25     ProxyElement.update (package:flutter/src/widgets/framework.dart:5154:5)
#26     Element.updateChild (package:flutter/src/widgets/framework.dart:3530:15)
#27     RenderObjectElement.updateChildren (package:flutter/src/widgets/framework.dart:5825:32)
#28     MultiChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:6375:17)
#29     Element.updateChild (package:flutter/src/widgets/framework.dart:3530:15)
#30     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4832:16)
#31     StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4977:11)
#32     Element.rebuild (package:flutter/src/widgets/framework.dart:4529:5)
#33     StatefulElement.update (package:flutter/src/widgets/framework.dart:5009:5)
#34     Element.updateChild (package:flutter/src/widgets/framework.dart:3530:15)
#35     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4832:16)
#36     Element.rebuild (package:flutter/src/widgets/framework.dart:4529:5)
#37     ProxyElement.update (package:flutter/src/widgets/framework.dart:5154:5)
#38     Element.updateChild (package:flutter/src/widgets/framework.dart:3530:15)
#39     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4832:16)
#40     StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4977:11)
#41     Element.rebuild (package:flutter/src/widgets/framework.dart:4529:5)
#42     StatefulElement.update (package:flutter/src/widgets/framework.dart:5009:5)
#43     Element.updateChild (package:flutter/src/widgets/framework.dart:3530:15)
#44     SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:6222:14)
#45     Element.updateChild (package:flutter/src/widgets/framework.dart:3530:15)
#46     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4832:16)
#47     Element.rebuild (package:flutter/src/widgets/framework.dart:4529:5)
#48     ProxyElement.update (package:flutter/src/widgets/framework.dart:5154:5)
#49     Element.updateChild (package:flutter/src/widgets/framework.dart:3530:15)
#50     SingleChildRenderObjectElement.update (package:flutter/src/widgets/framework.dart:6222:14)
#51     Element.updateChild (package:flutter/src/widgets/framework.dart:3530:15)
#52     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4832:16)
#53     StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4977:11)
#54     Element.rebuild (package:flutter/src/widgets/framework.dart:4529:5)
#55     StatefulElement.update (package:flutter/src/widgets/framework.dart:5009:5)
#56     Element.updateChild (package:flutter/src/widgets/framework.dart:3530:15)
#57     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4832:16)
#58     StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4977:11)
#59     Element.rebuild (package:flutter/src/widgets/framework.dart:4529:5)
#60     StatefulElement.update (package:flutter/src/widgets/framework.dart:5009:5)
#61     Element.updateChild (package:flutter/src/widgets/framework.dart:3530:15)
#62     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4832:16)
#63     Element.rebuild (package:flutter/src/widgets/framework.dart:4529:5)
#64     ProxyElement.update (package:flutter/src/widgets/framework.dart:5154:5)
#65     Element.updateChild (package:flutter/src/widgets/framework.dart:3530:15)
#66     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4832:16)
#67     Element.rebuild (package:flutter/src/widgets/framework.dart:4529:5)
#68     ProxyElement.update (package:flutter/src/widgets/framework.dart:5154:5)
#69     Element.updateChild (package:flutter/src/widgets/framework.dart:3530:15)
#70     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4832:16)
#71     StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4977:11)
#72     Element.rebuild (package:flutter/src/widgets/framework.dart:4529:5)
#73     StatefulElement.update (package:flutter/src/widgets/framework.dart:5009:5)
#74     Element.updateChild (package:flutter/src/widgets/framework.dart:3530:15)
#75     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4832:16)
#76     Element.rebuild (package:flutter/src/widgets/framework.dart:4529:5)
#77     ProxyElement.update (package:flutter/src/widgets/framework.dart:5154:5)
#78     Element.updateChild (package:flutter/src/widgets/framework.dart:3530:15)
#79     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4832:16)
#80     StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4977:11)
#81     Element.rebuild (package:flutter/src/widgets/framework.dart:4529:5)
#82     StatefulElement.update (package:flutter/src/widgets/framework.dart:5009:5)
#83     Element.updateChild (package:flutter/src/widgets/framework.dart:3530:15)
#84     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4832:16)
#85     StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4977:11)
#86     Element.rebuild (package:flutter/src/widgets/framework.dart:4529:5)
#87     StatefulElement.update (package:flutter/src/widgets/framework.dart:5009:5)
#88     Element.updateChild (package:flutter/src/widgets/framework.dart:3530:15)
#89     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4832:16)
#90     StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4977:11)
#91     Element.rebuild (package:flutter/src/widgets/framework.dart:4529:5)
#92     BuildOwner.buildScope (package:flutter/src/widgets/framework.dart:2659:19)
#93     WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:891:21)
#94     SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1146:15)
#95     SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1083:9)
#99     _invoke (dart:ui/hooks.dart:151:10)
#100    PlatformDispatcher._drawFrame (dart:ui/platform_dispatcher.dart:308:5)
#101    _drawFrame (dart:ui/hooks.dart:115:31)
(elided 3 frames from dart:async)
====================================================================================================
E/flutter (17550): [ERROR:flutter/lib/ui/ui_dart_state.cc(198)] Unhandled Exception: Null check operator used on a null value
E/flutter (17550): #0      StatefulElement.state (package:flutter/src/widgets/framework.dart:4926:44)
E/flutter (17550): #1      Navigator.of (package:flutter/src/widgets/navigator.dart:2542:47)
E/flutter (17550): #2      bProjects.downloadProject (package:hub_buildings/bloc/projects/bProjects.dart:78:15)
E/flutter (17550): <asynchronous suspension>
E/flutter (17550): 

[√] Flutter (Channel stable, 3.0.4, on Microsoft Windows [Versi¢n 10.0.19044.1766], locale es-ES)
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