Unhandled Exception: NoSuchMethodError: The getter ‘isNotEmpty’ was called on null.

Flutter Application Displaying white screen after installing…. same result on emulator and device

main.dart

import ‘package:flutter/material.dart’; import ‘package:get/get.dart’; import ‘package:provider/provider.dart’; import ‘package:testing_tabs/BookingHistory.dart’;
void main() {
runApp(
MultiProvider(child: MyApp()),
);
}

class MyApp extends StatelessWidget {
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return MaterialApp(
title: ‘Flutter Demo’,
theme: ThemeData(
primarySwatch: Colors.blue,
visualDensity: VisualDensity.adaptivePlatformDensity,
),
initialRoute: ‘/’,
routes: {
‘/’: (context) => BookingHistory(),
},
);
}
}

Logs

[ +553 ms] E/flutter (20114): [ERROR:flutter/lib/ui/ui_dart_state.cc(186)] Unhandled Exception: NoSuchMethodError: The getter ‘isNotEmpty’ was called on null.
[ ] E/flutter (20114): Receiver: null
[ ] E/flutter (20114): Tried calling: isNotEmpty
[ ] E/flutter (20114): #0 Object.noSuchMethod (dart:core-patch/object_patch.dart:54:5)
[ ] E/flutter (20114): #1 new Nested (package:nested/nested.dart:71:25)
[ ] E/flutter (20114): #2 new MultiProvider (package:provider/src/provider.dart:121:8)
[ ] E/flutter (20114): #3 main (package:testing_tabs/main.dart:7:10)
[ ] E/flutter (20114): #4 _runMainZoned.. (dart:ui/hooks.dart:140:25)
[ ] E/flutter (20114): #5 _rootRun (dart:async/zone.dart:1354:13)
[ ] E/flutter (20114): #6 _CustomZone.run (dart:async/zone.dart:1258:19)
[ ] E/flutter (20114): #7 _runZoned (dart:async/zone.dart:1788:10)
[ ] E/flutter (20114): #8 runZonedGuarded (dart:async/zone.dart:1776:12)
[ ] E/flutter (20114): #9 _runMainZoned. (dart:ui/hooks.dart:133:5)
[ ] E/flutter (20114): #10 _delayEntrypointInvocation. (dart:isolate-patch/isolate_patch.dart:283:19)
[ ] E/flutter (20114): #11 _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:184:12)
[ ] E/flutter (20114):
[+515007 ms] D/ViewRootImpl@fe2e6e1MainActivity: ViewPostIme pointer 0
[ +56 ms] D/ViewRootImpl@fe2e6e1MainActivity: ViewPostIme pointer 1

Flutter Doctor

Slashs-MacBook-Pro:testing_tabs slashglobal$ flutter doctor -v

[✓] Flutter (Channel stable, 2.0.1, on macOS 11.1 20C69 darwin-x64, locale en-US)
• Flutter version 2.0.1 at /Users/slashglobal/flutter
• Framework revision c5a4b40 (2 weeks ago), 2021-03-04 09:47:48 -0800
• Engine revision 40441def69
• Dart version 2.12.0

[✓] Android toolchain – develop for Android devices (Android SDK version 30.0.2)
• Android SDK at /Users/slashglobal/Library/Android/sdk
• Platform android-30, build-tools 30.0.2
• Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
• Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6915495)
• All Android licenses accepted.

[✓] Xcode – develop for iOS and macOS
• Xcode at /Applications/Xcode.app/Contents/Developer
• Xcode 12.4, Build version 12D4e
• CocoaPods version 1.10.0

[✓] Android Studio (version 4.1)
• Android Studio at /Applications/Android Studio.app/Contents
• Flutter plugin can be installed from:
🔨 https://plugins.jetbrains.com/plugin/9212-flutter
• Dart plugin can be installed from:
🔨 https://plugins.jetbrains.com/plugin/6351-dart
• Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6915495)

[✓] Connected device (2 available)
• SM A305F (mobile) • R58M78MVZNJ • android-arm64 • Android 10 (API 29)
• iPhone 12 Pro Max (mobile) • F02E3034-BDF8-4BDB-8044-1A715AF853CD • ios • com.apple.CoreSimulator.SimRuntime.iOS-14-4 (simulator)

• No issues found!

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