FlutterでFirebaseに接続しようとすると長文のエラーが出ます。

Question

#【質問】
Firebaseの公式サイトFlutter アプリに Firebase を追加する
に沿ってFlutter アプリを実行しようとすると、長文のエラーが出ます、自分でわかる範囲は試してみましたがエラーは解決しませんでした。
解決策をお教えいただけますか。
#【出ているエラー】

Launching lib/main.dart on iPhone 12 Pro Max in debug mode...
lib/main.dart:1
Xcode build done.                                           830.4s
Failed to build iOS app
Error output from Xcode build:
↳
    ** BUILD FAILED **
Xcode's output:
↳
    In file included from /Users/ホームディレクトリ/work/todo/ios/Pods/gRPC-Core/src/core/ext/filters/client_channel/xds/xds_channel_secure.cc:34:
 /Users/ホームディレクトリ/work/todo/ios/Pods/gRPC-Core/src/core/lib/security/credentials/credentials.h:205:15: warning: anonymous non-C-compatible type given name for linkage purposes by typedef declaration; add a tag name here [-Wnon-c-typedef-for-linkage]
    typedef struct {
                  ^
                   grpc_credentials_mdelem_array
    /Users/ホームディレクトリ/work/todo/ios/Pods/gRPC-Core/src/core/lib/security/credentials/credentials.h:206:21: note: type is not C-compatible due to this d
efault member initializer
      grpc_mdelem* md = nullptr;
                        ^~~~~~~
    /Users/ホームディレクトリ/work/todo/ios/Pods/gRPC-Core/src/core/lib/security/credentials/credentials.h:208:3: note: type is given name 'grpc_credentials_mdelem_array' for linkage purposes by this typedef declaration

---------------------------------------------------------------------------------------

#import <Flutter/Flutter.h>
            ^~~~~~~~~~~~~~~~~~~
    1 error generated.
    note: Using new build system
    note: Building targets in parallel
    note: Planning build
    note: Analyzing workspace
    note: Constructing build description
    note: Build preparation complete
warning: Capabilities for Signing & Capabilities may not function correctly because its entitlements use a placeholder team ID. To resolve this, select a development team in the Runner editor. (in target 'Runner' from project 'Runner')
Could not build the application for the simulator.
Error launching application on iPhone 12 Pro Max.
Exited (sigterm)

※全部載せると長すぎるので最初と最後だけ載せています
#【試したこと】
0. ターミナルでflutter clean
0. このサイトを見てPodfileを書き換えた
0. pubspec.yamlでfirebase関連のプラグインを最新に変えた
#【ファイル】
Podfile

# Uncomment this line to define a global platform for your project
platform :ios, '12.0'

# CocoaPods analytics sends network stats synchronously affecting flutter build latency.
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
  use_frameworks!
  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|
    target.build_configurations.each do |config|
      config.build_settings['IPHONEOS_DEPLOYMENT_TARGET'] = '9.0'
    end
  end
end

pubspec.yaml

name: todo
description: A new Flutter project.

publish_to: 'none' 
https://developer.android.com/studio/publish/versioning

version: 1.0.0+1

environment:
  sdk: ">=2.12.0 <3.0.0"

dependencies:
  flutter:
    sdk: flutter
  firebase_core: ^1.5.0
  firebase_analytics: ^8.3.0

 
  firebase_auth: ^3.0.2
  cloud_firestore: ^2.5.0
  
  cupertino_icons: ^1.0.2

dev_dependencies:
  flutter_test:
    sdk: flutter


flutter:

  
  uses-material-design: true

  

Answer 1

iosのディレクトリを削除してもう一度入れたら治った様な気がします。
僕もつまった事がありますが、これで解決しました。

rm -rf ios
flutter create -i swift .