title: "An error occurred while processing the post-install hook of the Podfile" in Flutter project
body: <p>I am installing pod for my Flutter project but getting an error. I don't know why this error is occuring. It throws error at the very end of installing...........................................................................................</p>
  <p><a href="https://i.stack.imgur.com/LVS2g.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/LVS2g.png" alt="enter image description here" /></a></p>
  <p>Pod file</p>
  <pre><code>    # Uncomment this line to define a global platform for your project
  # platform :ios, '9.0'
  
  # CocoaPods analytics sends network stats synchronously affecting flutter build latency.
  ENV['COCOAPODS_DISABLE_STATS'] = 'true'
  
  project 'Runner', {
    'Debug' =&gt; :debug,
    'Profile' =&gt; :release,
    'Release' =&gt; :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 &quot;#{generated_xcode_build_settings_path} must exist. If you're running pod install manually, make sure flutter pub get is executed first&quot;
    end
  
    File.foreach(generated_xcode_build_settings_path) do |line|
      matches = line.match(/FLUTTER_ROOT\=(.*)/)
      return matches[1].strip if matches
    end
    raise &quot;FLUTTER_ROOT not found in #{generated_xcode_build_settings_path}. Try deleting Generated.xcconfig, then run flutter pub get&quot;
  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!
  
    use_frameworks!
    pod 'CocoaMQTT/WebSockets', '1.3.0-rc.1'
  
  
    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)
    end
  end
  </code></pre>