Unhandled Exception: MissingPluginException(No implementation found for method Firebase#initializeCore on channel plugins.flutter.io/firebase_core) in "IOS" only

[SyedMuhammadMuhid]

I am unable to resolve this error that I get while I run my flutter app on ios Simulator (IPhone 12 pro max). This application is running normally on android emulators and devices.
The message that I get in Run:

Launching lib/main.dart on iPhone 12 Pro Max in debug mode...
Running Xcode build...
Xcode build done. 643.6s
Debug service listening on ws://127.0.0.1:59848/2DbBjErz6yw=/ws
Syncing files to device iPhone 12 Pro Max...

[VERBOSE-2:ui_dart_state.cc(199)] Unhandled Exception: MissingPluginException(No implementation found for method Firebase#initializeCore on channel plugins.flutter.io/firebase_core)
#0 MethodChannel._invokeMethod (package:flutter/src/services/platform_channel.dart:156:7)

#1 MethodChannel.invokeListMethod (package:flutter/src/services/platform_channel.dart:344:35)

#2 MethodChannelFirebase._initializeCore (package:firebase_core_platform_interface/src/method_channel/method_channel_firebase.dart:30:23)

#3 MethodChannelFirebase.initializeApp (package:firebase_core_platform_interface/src/method_channel/method_channel_firebase.dart:77:7)

#4 Firebase.initializeApp (package:firebase_core/src/firebase.dart:41:31)

#5 main (package:farmex/main.dart:19:3)

---

This is my main.dart

import 'package:firebase_core/firebase_core.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter_localizations/flutter_localizations.dart';
import 'Screens/select_language.dart';
import 'Services/phone_stream_service.dart';
import 'package:flutter_gen/gen_l10n/app_localizations.dart';
import 'package:flutter_gen/gen_l10n/app_localizations.dart';
import 'constants/language/language_preferences.dart';
import 'constants/constants_global.dart';
import 'package:localstorage/localstorage.dart';
import 'package:farmex/Services/api_services.dart';
import 'package:firebase_auth/firebase_auth.dart';
import 'package:shared_preferences/shared_preferences.dart';

void main()async {

WidgetsFlutterBinding.ensureInitialized();
await Firebase.initializeApp();

runApp(MyApp());
await getLanguage();
}

class MyApp extends StatefulWidget {

@OverRide
_MyAppState createState() => _MyAppState();
static _MyAppState of(BuildContext context) => context.findAncestorStateOfType<_MyAppState>();
}

class _MyAppState extends State with WidgetsBindingObserver{

Locale _locale;
bool wait = true;
User firebaseuser;

void setLocale(Locale value) {
if (mounted) {
setState(() {
_locale = value;
});
}
}

@OverRide
void initState() {

super.initState();

WidgetsBinding.instance.addObserver(this);

}
@OverRide
void dispose() {
WidgetsBinding.instance.removeObserver(this);
super.dispose();
}

@OverRide
Widget build(BuildContext context) {

if(langChanger==true){
  getBioData();
}

 return wait ? Container(
  color: Colors.white,
) : MaterialApp(

  locale:  Locale( (userLanguage != null && BioData != null) ? (userLanguage == BioData.userProfileLanguage ? userLanguage : BioData.userProfileLanguage) : (userLanguage == null && BioData != null)?(BioData.userProfileLanguage):(userLanguage != null && BioData == null ? userLanguage: "en" )),
  debugShowCheckedModeBanner: false,

  title:'Flutter Demo',
  theme: ThemeData(
    primarySwatch: Colors.green,
    fontFamily: 'geomanist',
    visualDensity: VisualDensity.adaptivePlatformDensity,
  ),

  home: PhoneAuthService().handleAuth(),

  localizationsDelegates: [
    AppLocalizations.delegate, // Add this line
    GlobalMaterialLocalizations.delegate,
    GlobalWidgetsLocalizations.delegate,
    GlobalCupertinoLocalizations.delegate,
  ],

  supportedLocales: [
    const Locale('ur', ''), // Urdu, no country code
    const Locale('en', ''), // English, no country code
  ],
);

}

void getBioData()async {
langChanger=false;
firebaseuser = await FirebaseAuth.instance.currentUser;
if(firebaseuser!=null) {
Global_access_token = await LoginServices(
firebaseId: firebaseuser.uid.toString(), appId: Global_appId)
.getAccessToken();
print(Global_access_token);
await GetUserBioData(accessToken: Global_access_token)
.GetUserBioDataDetails()
.then((value) {
if (mounted) {
setState(() {
BioData = value[0];
wait = false;
});
}
print(
"I am the BioData var, i contain language data. Language is: ${BioData
.userProfileLanguage}");
});
}
else{
if (mounted) {
setState(() {
wait = false;
});
}
}
}
}

void getLanguage()async{

SharedPreferences.setMockInitialValues({});
SharedPreferences Lang = await SharedPreferences.getInstance();
userLanguage = Lang.getString('userLanguage');
print('getLanguage() called, userlanguage : ${userLanguage}');
}

---

This is my project's pubspec.yaml

name: farmex
description: A new Flutter application.

version: 1.0.1+8

environment:
sdk: ">=2.7.0 <3.0.0"

dependencies:
flutter:
sdk: flutter
flutter_localizations:
sdk: flutter

cupertino_icons: ^1.0.3
google_fonts: ^2.1.0

pin_entry_text_field: ^0.1.4
font_awesome_flutter: ^9.0.0
flutter_svg: ^0.22.0
table_calendar: ^3.0.0
roundcheckbox: ^2.0.1
http: ^0.13.3
flutter_spinkit: ^5.0.0
toast: ^0.1.5
modal_progress_hud: ^0.1.3

intl: ^0.17.0
im_stepper: ^0.1.3
google_maps_flutter: ^2.0.5
flutter_datetime_picker: ^1.5.1
geolocator: ^7.0.3
location: ^4.1.1
geocoding: ^2.0.0
geocoder: ^0.2.1
image_picker: ^0.7.5+3
firebase_storage: ^8.1.0
flutter_tts: ^3.1.0
charts_flutter: ^0.10.0
photo_view: ^0.11.1
showcaseview: ^1.0.0
holding_gesture: ^1.1.0
flutter_plugin_record: ^1.0.1
audioplayers: ^0.19.0
permission_handler: ^8.0.0+2
shared_preferences: ^2.0.6
dots_indicator: ^2.0.0
localstorage: ^4.0.0+1
qr_code_scanner: ^0.4.0
android_intent: ^2.0.1
firebase_auth: ^1.2.0
firebase_core: "^1.2.0"

dependency_overrides:

uses-material-design: true

assets:
- assets/images/
- assets/icons/
- assets/weather/
- assets/more/
- assets/news/

fonts:
- family: geomanist
fonts:
- asset: fonts/geomanist-regular-webfont.ttf

---

This is the project's AppDelegate.swift

import UIKit
import Firebase
import Flutter
import GoogleMaps

@UIApplicationMain

@objc class AppDelegate: FlutterAppDelegate {
override func application(
_ application: UIApplication,
didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]? = nil
) -> Bool {
FirebaseApp.configure()
GMSServices.provideAPIKey("AIzaSyBvwaQSH5IxqTPWIHA2LctbqdrP8MRyK_w")
return super.application(application, didFinishLaunchingWithOptions: launchOptions) // YES;
}
}

This is the project's AppDelegate.m

#include "AppDelegate.h"
#include "GeneratedPluginRegistrant.h"
#import "GoogleMaps/GoogleMaps.h"

@import UIKit;
@import Firebase;

@implementation AppDelegate

• (BOOL)application:(UIApplication *)application
  didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
  [GMSServices provideAPIKey:@"AIzaSyBvwaQSH5IxqTPWIHA2LctbqdrP8MRyK_w"];
  [FIRApp configure];
  [GeneratedPluginRegistrant registerWithRegistry:self];
  return [super application:application didFinishLaunchingWithOptions:launchOptions]; // YES;
  }
  @EnD

---

This is the Podfile

platform :ios, '10.2'

ENV['COCOAPODS_DISABLE_STATS'] = 'true'

project 'Runner', {
'Debug' => :debug,
'Profile' => :release,
'Release' => :release,
}

def flutter_root
generated_xcode_build_settings_path = File.expand_path(File.join('..', 'Flutter', 'Generated.xcconfig'), FILE)
unless File.exist?(generated_xcode_build_settings_path)
raise "#{generated_xcode_build_settings_path} must exist. If you're running pod install manually, make sure flutter pub get is executed first"
end

File.foreach(generated_xcode_build_settings_path) do |line|
matches = line.match(/FLUTTER_ROOT=(.*)/)
return matches[1].strip if matches
end
raise "FLUTTER_ROOT not found in #{generated_xcode_build_settings_path}. Try deleting Generated.xcconfig, then run flutter pub get"
end

require File.expand_path(File.join('packages', 'flutter_tools', 'bin', 'podhelper'), flutter_root)

flutter_ios_podfile_setup

target 'Runner' do

pod 'Firebase/Auth'
pod 'Firebase/Firestore'
pod 'Firebase/Core'

use_frameworks! #add here
use_modular_headers!
flutter_install_all_ios_pods File.dirname(File.realpath(FILE))
end

post_install do |installer|
installer.pods_project.targets.each do |target|
flutter_additional_ios_build_settings(target)
target.build_configurations.each do |config|
config.build_settings['IPHONEOS_DEPLOYMENT_TARGET'] = '10.2'

          config.build_settings['GCC_PREPROCESSOR_DEFINITIONS'] ||= [
            '$(inherited)',

            'PERMISSION_CAMERA=1',
            'PERMISSION_MICROPHONE=1',
            'PERMISSION_PHOTOS=1',
            'PERMISSION_LOCATION=1',
            'PERMISSION_MEDIA_LIBRARY=1',
            'PERMISSION_SENSORS=1',

            
          ]

  end

end
end

---

flutter doctor -v

flutter doctor -v
[✓] Flutter (Channel stable, 2.2.0, on macOS 11.3 20E232 darwin-x64, locale en-AE)
• Flutter version 2.2.0 at /Users/xyphertechnologies/developer/flutter
• Framework revision b22742018b (13 days ago), 2021-05-14 19:12:57 -0700
• Engine revision a9d88a4d18
• Dart version 2.13.0

[!] Android toolchain - develop for Android devices (Android SDK version 30.0.3)
• Android SDK at /Users/xyphertechnologies/Library/Android/sdk
• Platform android-30, build-tools 30.0.3
• 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)
! Some Android licenses not accepted. To resolve this, run: flutter doctor --android-licenses

[✓] Xcode - develop for iOS and macOS
• Xcode at /Applications/Xcode.app/Contents/Developer
• Xcode 12.5, Build version 12E262
• CocoaPods version 1.10.1

[✓] Chrome - develop for the web
• Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] 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)
• iPhone 12 Pro Max (mobile) • C0615887-44CC-4010-8DF8-7F77ED55F4D4 • ios • com.apple.CoreSimulator.SimRuntime.iOS-14-5 (simulator)

---

Androis studio ios file structure:

xcode Runner.xcworkspace file structure:

I hope you can help me find a solution to this issue, I am stuck on this for days now, thanks.