showing growable error

[samuelxencov]

[ERROR:flutter/lib/ui/ui_dart_state.cc(209)] Unhandled Exception: Bad state: No element
E/flutter (10946): #0 List.first (dart:core-patch/growable_array.dart:360:5)
E/flutter (10946): #1 new TimeScaleConv (package:graphic/src/scale/time.dart:49:27)
E/flutter (10946): #2 ScaleConvOp.evaluate (package:graphic/src/scale/scale.dart:155:21)
E/flutter (10946): #3 Operator.run (package:graphic/src/dataflow/operator.dart:87:29)
E/flutter (10946): #4 Dataflow.evaluate (package:graphic/src/dataflow/dataflow.dart:95:27)
E/flutter (10946): #5 View.evaluate (package:graphic/src/chart/view.dart:69:17)
E/flutter (10946): #6 Dataflow.run (package:graphic/src/dataflow/dataflow.dart:123:16)
E/flutter (10946): #7 new View (package:graphic/src/chart/view.dart:25:5)
E/flutter (10946): #8 _ChartLayoutDelegate.getPositionForChild (package:graphic/src/chart/chart.dart:680:20)
E/flutter (10946): #9 RenderCustomSingleChildLayoutBox.performLayout (package:flutter/src/rendering/shifted_box.dart:1363:41)
E/flutter (10946): #10 RenderObject.layout (package:flutter/src/rendering/object.dart:1887:7)
E/flutter (10946): #11 RenderPadding.performLayout (package:flutter/src/rendering/shifted_box.dart:233:12)
E/flutter (10946): #12 RenderObject.layout (package:flutter/src/rendering/object.dart:1887:7)
E/flutter (10946): #13 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:116:14)
E/flutter (10946): #14 RenderObject.layout (package:flutter/src/rendering/object.dart:1887:7)
E/flutter (10946): #15 RenderConstrainedBox.performLayout (package:flutter/src/rendering/proxy_box.dart:277:14)
E/flutter (10946): #16 RenderObject.layout (package:flutter/src/rendering/object.dart:1887:7)
E/flutter (10946): #17 RenderPadding.performLayout (package:flutter/src/rendering/shifted_box.dart:233:12)
E/flutter (10946): #18 RenderObject.layout (package:flutter/src/rendering/object.dart:1887:7)
E/flutter (10946): #19 ChildLayoutHelper.layoutChild (package:flutter/src/rendering/layout_helper.dart:56:11)
E/flutter (10946): #20 RenderFlex._computeSizes (package:flutter/src/rendering/flex.dart:829:43)
E/flutter (10946): #21 RenderFlex.performLayout (package:flutter/src/rendering/flex.dart:931:32)
E/flutter (10946): #22 RenderObject.layout (package:flutter/src/rendering/object.dart:1887:7)
E/flutter (10946): #23 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:116:14)
E/flutter (10946): #24 RenderObject.layout (package:flutter/src/rendering/object.dart:1887:7)
E/flutter (10946): #25 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:116:14)
E/flutter (10946): #26 RenderCustomPaint.performLayout (package:flutter/src/rendering/custom_paint.dart:545:11)
E/flutter (10946): #27 RenderObject.layout (package:flutter/src/rendering/object.dart:1887:7)
E/flutter (10946): #28 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:116:14)
E/flutter (10946): #29 _RenderCustomClip.performLayout (package:flutter/src/rendering/proxy_box.dart:1376:11)
E/flutter (10946): #30 RenderObject.layout (package:flutter/src/rendering/object.dart:1887:7)
E/flutter (10946): #31 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:116:14)
E/flutter (10946): #32 RenderObject.layout (package:flutter/src/rendering/object.dart:1887:7)
E/flutter (10946): #33 RenderCustomSingleChildLayoutBox.performLayout (package:flutter/src/rendering/shifted_box.dart:1361:14)
E/flutter (10946): #34 RenderObject.layout (package:flutter/src/rendering/object.dart:1887:7)
E/flutter (10946): #35 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:116:14)
E/flutter (10946): #36 _RenderCustomClip.performLayout (package:flutter/src/rendering/proxy_box.dart:1376:11)
E/flutter (10946): #37 RenderObject.layout (package:flutter/src/rendering/object.dart:1887:7)
E/flutter (10946): #38 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:116:14)
E/flutter (10946): #39 RenderObject.layout (package:flutter/src/rendering/object.dart:1887:7)
E/flutter (10946): #40 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:116:14)
E/flutter (10946): #41 RenderObject.layout (package:flutter/src/rendering/object.dart:1887:7)
E/flutter (10946): #42 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:116:14)
E/flutter (10946): #43 RenderObject.layout (package:flutter/src/rendering/object.dart:1887:7)
E/flutter (10946): #44 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:116:14)
E/flutter (10946): #45 RenderObject.layout (package:flutter/src/rendering/object.dart:1887:7)
E/flutter (10946): #46 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:116:14)
E/flutter (10946): #47 RenderObject.layout (package:flutter/src/rendering/object.dart:1887:7)
E/flutter (10946): #48 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:116:14)
E/flutter (10946): #49 RenderObject.layout (package:flutter/src/rendering/object.dart:1887:7)
E/flutter (10946): #50 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:116:14)
E/flutter (10946): #51 RenderOffstage.performLayout (package:flutter/src/rendering/proxy_box.dart:3430:13)
E/flutter (10946): #52 RenderObject.layout (package:flutter/src/rendering/object.dart:1887:7)
E/flutter (10946): #53 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:116:14)
E/flutter (10946): #54 RenderObject.layout (package:flutter/src/rendering/object.dart:1887:7)
E/flutter (10946): #55 _RenderTheatre.performLayout (package:flutter/src/widgets/overlay.dart:751:15)
E/flutter (10946): #56 RenderObject._layoutWithoutResize (package:flutter/src/rendering/object.dart:1731:7)
E/flutter (10946): #57 PipelineOwner.flushLayout (package:flutter/src/rendering/object.dart:887:18)
E/flutter (10946): #58 RendererBinding.drawFrame (package:flutter/src/rendering/binding.dart:497:19)
E/flutter (10946): #59 WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:883:13)
E/flutter (10946): #60 SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1144:15)
E/flutter (10946): #61 SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1081:9)
E/flutter (10946): #62 _rootRun (dart:async/zone.dart:1426:13)
E/flutter (10946): #63 _CustomZone.run (dart:async/zone.dart:1328:19)
E/flutter (10946): #64 _CustomZone.runGuarded (dart:async/zone.dart:1236:7)

Here my code , can any on tell how to solve that. I want to create the Real Time series graph. I am using Firebase to get real time value.

seriesData.add(TimeSeriesSales(
DateTime(
newTime.year,
newTime.month,
newTime.day,
newTime.hour,
newTime.minute,
newTime.second,
),
realValue));

final List seriesData = [];

Container(
padding: const EdgeInsets.all(10),
color: Colors.grey.shade300,
width: 350,
height: 300,
child: Chart(
data: seriesData,
rebuild: true,
changeData: true,
variables: {
'time': Variable(
accessor: (TimeSeriesSales kk) => kk.time,
scale: TimeScale(
formatter: (time) => _monthDayFormat.format(time),
),
),
'sales': Variable(
accessor: (TimeSeriesSales ll) => ll.sales,
),
},
elements: [
LineElement(
shape: ShapeAttr(value: BasicLineShape(loop: true)),
selected: {
'touchMove': {1}
},
)
],
axes: [
Defaults.horizontalAxis,
Defaults.verticalAxis,
],
selections: {
'touchMove': PointSelection(on: {
GestureType.scaleUpdate,
GestureType.tapDown,
GestureType.longPressMoveUpdate
}, dim: 1)
},
tooltip: TooltipGuide(
followPointer: [false, true],
align: Alignment.topLeft,
backgroundColor: AppColors.activeBtnColor,
offset: const Offset(-20, -20),
),
crosshair: CrosshairGuide(followPointer: [false, false]),
),
),

class TimeSeriesSales {
final DateTime time;
num sales;

TimeSeriesSales(this.time, this.sales);
}

[entronad]

The timeScale, if min and max are not set, will get the range from data values. In this case you have to ensure your data list is not empty. Or you will have to set the min and max.

[samuelxencov]

Can you give any example to do that or Can you modify my code which can really help me.

[entronad]

scale: TimeScale(
formatter: (time) => _monthDayFormat.format(time),
min: oneDayBeforeNow,
max: now,
),