title: Failed assertion: line 1205 pos 12: '<optimized out>': is not true
body: <p>I am new to flutter and facing an issue in Syncfusion Calendar widget. Any help will be appreciated. Here is the code inside my build widget:</p>
  <pre><code>  return  Scaffold(
    resizeToAvoidBottomInset: false, // set it to false
    body: SafeArea(
      child: SfCalendar(
                  view: CalendarView.month,
                  dataSource:getData(),
                  monthViewSettings: MonthViewSettings(showAgenda: true,),
  
        ),
    ),
  ); 
  </code></pre>
  <blockquote>
  <p>'dart:ui/painting.dart': Failed assertion: line 1205 pos 12: '': is not true.</p>
  </blockquote>
  <blockquote>
  <p>Here is the exception line:4 &gt; child: SfCalendar()</p>
  </blockquote>
  <p>Here is the stacktrace:</p>
  <p>**&gt;   The relevant error-causing widget was:    SfCalendar</p>
  <blockquote>
  <p>file:///Users/kashif/Desktop/AppRack/clique/lib/bottomDashboard/Calendar.dart:47:16
  When the exception was thrown, this was the stack:
  #2      Paint.color= (dart:ui/painting.dart:1205:12)
  #3      _AppointmentRenderObject._drawMonthAppointmentIndicator (package:syncfusion_flutter_calendar/src/calendar/appointment_layout/appointment_layout.dart:2042:15)
  #4      _AppointmentRenderObject._drawMonthAppointment (package:syncfusion_flutter_calendar/src/calendar/appointment_layout/appointment_layout.dart:1698:9)
  #5      _AppointmentRenderObject._drawCustomAppointmentView (package:syncfusion_flutter_calendar/src/calendar/appointment_layout/appointment_layout.dart:1662:11)
  #6      _AppointmentRenderObject.paint (package:syncfusion_flutter_calendar/src/calendar/appointment_layout/appointment_layout.dart:1614:7)
  #7      RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:2396:7)
  #8      PaintingContext._repaintCompositedChild (package:flutter/src/rendering/object.dart:139:11)
  #9      PaintingContext.repaintCompositedChild (package:flutter/src/rendering/object.dart:100:5)
  #10     PipelineOwner.flushPaint (package:flutter/src/rendering/object.dart:975:29)
  #11     RendererBinding.drawFrame (package:flutter/src/rendering/binding.dart:464:19)
  #12     WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:879:13)
  #13     RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:328:5)
  #14     SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1143:15)
  #15     SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1080:9)
  #16     SchedulerBinding._handleDrawFrame (package:flutter/src/scheduler/binding.dart:996:5)
  #20     _invoke (dart:ui/hooks.dart:163:10)
  #21     PlatformDispatcher._drawFrame (dart:ui/platform_dispatcher.dart:259:5)
  #22     _drawFrame (dart:ui/hooks.dart:126:31) (elided 5 frames from class _AssertionError and dart:async) The following RenderObject was
  being processed when the exception was fired:
  _AppointmentRenderObject#b4ead ...  needs compositing ...  parentData:  (can use size) ...  constraints: BoxConstraints(w=411.4,
  h=452.8) ...  layer: OffsetLayer#2d0bc ...    engine layer:
  OffsetEngineLayer#fc8e9 ...    offset: Offset(0.0, 0.0) ...  size:
  Size(411.4, 452.8) RenderObject: _AppointmentRenderObject#b4ead<br />
  needs compositing   parentData:  (can use size)   constraints:
  BoxConstraints(w=411.4, h=452.8)   layer: OffsetLayer#2d0bc
  engine layer: OffsetEngineLayer#fc8e9
  offset: Offset(0.0, 0.0)   size: Size(411.4, 452.8)
  ====================================================================================================**</p>
  </blockquote>