Its crashing when I change the view of calendar from 'Month' to 'Program'

Line 912 got : return SfCalendar() and its the same as example
`======== Exception caught by rendering library =====================================================
The following assertion was thrown during performLayout():
'package:flutter/src/rendering/viewport.dart': Failed assertion: line 1532 pos 12: 'correctedOffset.isFinite': is not true.

Either the assertion indicates an error in the framework itself, or we should provide substantially more information in this error message to help you determine and fix the underlying cause.
In either case, please report this assertion by filing a bug on GitHub:
https://github.com/flutter/flutter/issues/new?template=2_bug.md

The relevant error-causing widget was:
SfCalendar SfCalendar:file:///Users/Developer_Flutter/Apps/lib/pages/admin/getting_started.dart:912:12
When the exception was thrown, this was the stack:
#2 RenderViewport._attemptLayout (package:flutter/src/rendering/viewport.dart:1532:12)
#3 RenderViewport.performLayout (package:flutter/src/rendering/viewport.dart:1489:20)
#4 RenderObject.layout (package:flutter/src/rendering/object.dart:1852:7)
#5 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:116:14)
#6 RenderObject.layout (package:flutter/src/rendering/object.dart:1852:7)
#7 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:116:14)
#8 RenderObject.layout (package:flutter/src/rendering/object.dart:1852:7)
#9 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:116:14)
#10 RenderObject.layout (package:flutter/src/rendering/object.dart:1852:7)
#11 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:116:14)
#12 RenderObject.layout (package:flutter/src/rendering/object.dart:1852:7)
#13 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:116:14)
#14 RenderObject.layout (package:flutter/src/rendering/object.dart:1852:7)
#15 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:116:14)
#16 RenderObject.layout (package:flutter/src/rendering/object.dart:1852:7)
#17 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:116:14)
#18 RenderObject.layout (package:flutter/src/rendering/object.dart:1852:7)
#19 RenderStack.layoutPositionedChild (package:flutter/src/rendering/stack.dart:497:11)
#20 RenderStack.performLayout (package:flutter/src/rendering/stack.dart:610:30)
#21 RenderObject.layout (package:flutter/src/rendering/object.dart:1852:7)
#22 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:116:14)
#23 RenderObject.layout (package:flutter/src/rendering/object.dart:1852:7)
#24 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:116:14)
#25 RenderObject.layout (package:flutter/src/rendering/object.dart:1852:7)
#26 RenderConstrainedBox.performLayout (package:flutter/src/rendering/proxy_box.dart:277:14)
#27 RenderObject.layout (package:flutter/src/rendering/object.dart:1852:7)
#28 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:116:14)
#29 RenderObject.layout (package:flutter/src/rendering/object.dart:1852:7)
#30 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:116:14)
#31 RenderObject.layout (package:flutter/src/rendering/object.dart:1852:7)
#32 _RenderLayoutBuilder.performLayout (package:flutter/src/widgets/layout_builder.dart:319:14)
#33 RenderObject.layout (package:flutter/src/rendering/object.dart:1852:7)
#34 RenderProxyBoxMixin.performLayout (package:flutter/src/rendering/proxy_box.dart:116:14)
#35 RenderObject.layout (package:flutter/src/rendering/object.dart:1852:7)
#36 ChildLayoutHelper.layoutChild (package:flutter/src/rendering/layout_helper.dart:56:11)
#37 RenderFlex._computeSizes (package:flutter/src/rendering/flex.dart:896:45)
#38 RenderFlex.performLayout (package:flutter/src/rendering/flex.dart:931:32)
#39 RenderObject.layout (package:flutter/src/rendering/object.dart:1852:7)
#40 RenderSliverRefreshBody.performLayout (package:pull_to_refresh/src/internals/slivers.dart:542:14)
#41 RenderObject.layout (package:flutter/src/rendering/object.dart:1852:7)
#42 RenderViewportBase.layoutChildSequence (package:flutter/src/rendering/viewport.dart:510:13)
#43 RenderViewport._attemptLayout (package:flutter/src/rendering/viewport.dart:1580:12)
#44 RenderViewport.performLayout (package:flutter/src/rendering/viewport.dart:1489:20)
#45 RenderObject._layoutWithoutResize (package:flutter/src/rendering/object.dart:1707:7)
#46 PipelineOwner.flushLayout (package:flutter/src/rendering/object.dart:879:18)
#47 RendererBinding.drawFrame (package:flutter/src/rendering/binding.dart:497:19)
#48 WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:883:13)
#49 RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:363:5)
#50 SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1145:15)
#51 SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1082:9)
#52 SchedulerBinding._handleDrawFrame (package:flutter/src/scheduler/binding.dart:996:5)
#56 _invoke (dart:ui/hooks.dart:150:10)
#57 PlatformDispatcher._drawFrame (dart:ui/platform_dispatcher.dart:270:5)
#58 _drawFrame (dart:ui/hooks.dart:114:31)
(elided 5 frames from class _AssertionError and dart:async)
The following RenderObject was being processed when the exception was fired: RenderViewport#57e0d NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
... needs compositing
... parentData: (can use size)
... constraints: BoxConstraints(w=414.0, h=714.0)
... size: Size(414.0, 714.0)
... axisDirection: down
... crossAxisDirection: right
... offset: ScrollPositionWithSingleContext#45596(offset: Infinity, range: -Infinity..Infinity, viewport: 714.0, ScrollableState, AlwaysScrollableScrollPhysics -> BouncingScrollPhysics -> RangeMaintainingScrollPhysics, BallisticScrollActivity#a5e6d(AnimationController#e111e(▶ 95.000; for BallisticScrollActivity)), ScrollDirection.idle)
... anchor: 0.0
RenderObject: RenderViewport#57e0d NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
needs compositing
parentData: (can use size)
constraints: BoxConstraints(w=414.0, h=714.0)
size: Size(414.0, 714.0)
axisDirection: down
crossAxisDirection: right
offset: ScrollPositionWithSingleContext#45596(offset: Infinity, range: -Infinity..Infinity, viewport: 714.0, ScrollableState, AlwaysScrollableScrollPhysics -> BouncingScrollPhysics -> RangeMaintainingScrollPhysics, BallisticScrollActivity#a5e6d(AnimationController#e111e(▶ 95.000; for BallisticScrollActivity)), ScrollDirection.idle)
anchor: 0.0
... child -1: RenderSliverList#9dcd8 relayoutBoundary=up1 NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
... parentData: paintOffset=Offset(0.0, 0.0) (can use size)
... constraints: SliverConstraints(AxisDirection.down, GrowthDirection.reverse, ScrollDirection.idle, scrollOffset: 0.0, remainingPaintExtent: 0.0, crossAxisExtent: 414.0, crossAxisDirection: AxisDirection.right, viewportMainAxisExtent: 714.0, remainingCacheExtent: 155.0, cacheOrigin: 0.0)
... geometry: SliverGeometry(scrollExtent: Infinity, hidden, maxPaintExtent: Infinity, hasVisualOverflow: true, cacheExtent: 155.0)
... scrollExtent: Infinity
... hidden
... maxPaintExtent: Infinity
... hasVisualOverflow: true
... cacheExtent: 155.0
... currently live children: 0 to 1
... child with index 0: RenderIndexedSemantics#ab8bc relayoutBoundary=up2 NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
... parentData: index=0; layoutOffset=0.0 (can use size)
... constraints: BoxConstraints(w=414.0, 0.0<=h<=Infinity)
... size: Size(414.0, 35.0)
... index: 0
... child: RenderRepaintBoundary#aa826 relayoutBoundary=up3 NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
... needs compositing
... parentData: (can use size)
... constraints: BoxConstraints(w=414.0, 0.0<=h<=Infinity)
... size: Size(414.0, 35.0)
... usefulness ratio: no metrics collected yet (never painted)
... child: RenderConstrainedBox#cd6c0 relayoutBoundary=up4 NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
... parentData: (can use size)
... constraints: BoxConstraints(w=414.0, 0.0<=h<=Infinity)
... size: Size(414.0, 35.0)
... additionalConstraints: BoxConstraints(0.0<=w<=Infinity, h=35.0)
... child with index 1: RenderIndexedSemantics#93273 relayoutBoundary=up2 NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
... parentData: index=1; layoutOffset=35.0 (can use size)
... constraints: BoxConstraints(w=414.0, 0.0<=h<=Infinity)
... size: Size(414.0, 190.0)
... index: 1
... child: RenderRepaintBoundary#4d557 relayoutBoundary=up3 NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
... needs compositing
... parentData: (can use size)
... constraints: BoxConstraints(w=414.0, 0.0<=h<=Infinity)
... size: Size(414.0, 190.0)
... usefulness ratio: no metrics collected yet (never painted)
... child: RenderConstrainedBox#23507 relayoutBoundary=up4 NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
... parentData: (can use size)
... constraints: BoxConstraints(w=414.0, 0.0<=h<=Infinity)
... size: Size(414.0, 190.0)
... additionalConstraints: BoxConstraints(0.0<=w<=Infinity, h=190.0)
... center child: RenderSliverList#1f37d relayoutBoundary=up1 NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
... parentData: paintOffset=Offset(0.0, 0.0) (can use size)
... constraints: SliverConstraints(AxisDirection.down, GrowthDirection.forward, ScrollDirection.idle, scrollOffset: 95.0, remainingPaintExtent: 714.0, crossAxisExtent: 414.0, crossAxisDirection: AxisDirection.right, viewportMainAxisExtent: 714.0, remainingCacheExtent: 1059.0, cacheOrigin: -95.0)
... geometry: SliverGeometry(scrollExtent: Infinity, paintExtent: 714.0, maxPaintExtent: Infinity, hasVisualOverflow: true, cacheExtent: 1059.0)
... scrollExtent: Infinity
... paintExtent: 714.0
... maxPaintExtent: Infinity
... hasVisualOverflow: true
... cacheExtent: 1059.0
... currently live children: 0 to 2
... child with index 0: RenderIndexedSemantics#e153f relayoutBoundary=up2 NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
... parentData: index=0; layoutOffset=0.0 (can use size)
... constraints: BoxConstraints(w=414.0, 0.0<=h<=Infinity)
... size: Size(414.0, 155.0)
... index: 0
... child: RenderRepaintBoundary#9a5be relayoutBoundary=up3 NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
... needs compositing
... parentData: (can use size)
... constraints: BoxConstraints(w=414.0, 0.0<=h<=Infinity)
... size: Size(414.0, 155.0)
... usefulness ratio: no metrics collected yet (never painted)
... child: RenderConstrainedBox#4efa9 relayoutBoundary=up4 NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
... parentData: (can use size)
... constraints: BoxConstraints(w=414.0, 0.0<=h<=Infinity)
... size: Size(414.0, 155.0)
... additionalConstraints: BoxConstraints(0.0<=w<=Infinity, h=155.0)
... child with index 1: RenderIndexedSemantics#c8d54 relayoutBoundary=up2 NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
... parentData: index=1; layoutOffset=155.0 (can use size)
... constraints: BoxConstraints(w=414.0, 0.0<=h<=Infinity)
... size: Size(414.0, 440.0)
... index: 1
... child: RenderRepaintBoundary#589ea relayoutBoundary=up3 NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
... needs compositing
... parentData: (can use size)
... constraints: BoxConstraints(w=414.0, 0.0<=h<=Infinity)
... size: Size(414.0, 440.0)
... usefulness ratio: no metrics collected yet (never painted)
... child: RenderConstrainedBox#f68f7 relayoutBoundary=up4 NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
... parentData: (can use size)
... constraints: BoxConstraints(w=414.0, 0.0<=h<=Infinity)
... size: Size(414.0, 440.0)
... additionalConstraints: BoxConstraints(0.0<=w<=Infinity, h=440.0)
... child with index 2: RenderIndexedSemantics#a9cbf relayoutBoundary=up2 NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
... parentData: index=2; layoutOffset=595.0 (can use size)
... constraints: BoxConstraints(w=414.0, 0.0<=h<=Infinity)
... size: Size(414.0, 1650.0)
... index: 2
... child: RenderRepaintBoundary#fe504 relayoutBoundary=up3 NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
... needs compositing
... parentData: (can use size)
... constraints: BoxConstraints(w=414.0, 0.0<=h<=Infinity)
... size: Size(414.0, 1650.0)
... usefulness ratio: no metrics collected yet (never painted)
... child: RenderConstrainedBox#f42d6 relayoutBoundary=up4 NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
... parentData: (can use size)
... constraints: BoxConstraints(w=414.0, 0.0<=h<=Infinity)
... size: Size(414.0, 1650.0)
... additionalConstraints: BoxConstraints(0.0<=w<=Infinity, h=1650.0)`