xcode - FlutterFlutter.h not found while making flutter build? - Stack Overflow

i am facing flutter/flutter.h not found issue while installing or making the ios build from xcode, my Podfile is

        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|
        flutter_additional_ios_build_settings(target)
        target.build_configurations.each do |config|
          config.build_settings['IPHONEOS_DEPLOYMENT_TARGET'] = '12.0'
          config.build_settings['EXCLUDED_ARCHS[sdk=iphonesimulator*]'] = 'arm64'
        end
      end
    end

Recently it was working but arises suddenly dont how why?

i have tried many option but nothing is working