flutter error Invalid `Podfile` file: no implicit conversion of nil into String. ive searched through discussions but I cant seem to fix the issue

Question

This is the error I am receiving. I tried flutter clean and changing the syntax of some lines but im new to dart and flutter so im not really sure. I reinstalled cocoa pods and ruby as well but Im receiving the same error. I also made sure to update ruby to the latest version.

  [!] Invalid `Podfile` file: no implicit conversion of nil into String.          #  from /Users/(name)/Downloads/Projects/doctor_consultation_app/ios/Podfile:57          #  -------------------------------------------          #      unless File.exist?(copied_framework_path)          >        FileUtils.cp(File.join(cached_framework_dir, 'Flutter.framework'), copied_flutter_dir)          #      end          #  ------------------------------------------- 

This is my pod file.

# 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' => :debug,   'Profile' => :release,   'Release' => :release, }  def parse_KV_file(file, separator='=')   file_abs_path = File.expand_path(file)   if !File.exists? file_abs_path     return [];   end   generated_key_values = {}   skip_line_start_symbols = ["#", "/"]   File.foreach(file_abs_path) do |line|     next if skip_line_start_symbols.any? { |symbol| line =~ /^\s*#{symbol}/ }     plugin = line.split(pattern=separator)     if plugin.length == 2       podname = plugin[0].strip()       path = plugin[1].strip()       podpath = File.expand_path("#{path}", file_abs_path)       generated_key_values[podname] = podpath     else       puts "Invalid plugin specification: #{line}"     end   end   generated_key_values end  target 'Runner' do   use_frameworks!   use_modular_headers!    # Flutter Pod    copied_flutter_dir = File.join(__dir__, 'Flutter')   copied_framework_path = File.join(copied_flutter_dir, 'Flutter.framework')   copied_podspec_path = File.join(copied_flutter_dir, 'Flutter.podspec')   unless File.exist?(copied_framework_path) && File.exist?(copied_podspec_path)     # Copy Flutter.framework and Flutter.podspec to Flutter/ to have something to link against if the xcode backend script has not run yet.     # That script will copy the correct debug/profile/release version of the framework based on the currently selected Xcode configuration.     # CocoaPods will not embed the framework on pod install (before any build phases can generate) if the dylib does not exist.      generated_xcode_build_settings_path = File.join(copied_flutter_dir, 'Generated.xcconfig')     unless File.exist?(generated_xcode_build_settings_path)       raise "Generated.xcconfig must exist. If you're running pod install manually, make sure flutter pub get is executed first"     end     generated_xcode_build_settings = parse_KV_file(generated_xcode_build_settings_path)     cached_framework_dir = generated_xcode_build_settings['FLUTTER_FRAMEWORK_DIR'];      unless File.exist?(copied_framework_path)       FileUtils.cp_r(File.join(cached_framework_dir, 'Flutter.framework'), copied_flutter_dir)     end     unless File.exist?(copied_podspec_path)       FileUtils.cp(File.join(cached_framework_dir, 'Flutter.podspec'), copied_flutter_dir)     end   end    # Keep pod path relative so it can be checked into Podfile.lock.   pod 'Flutter', :path => 'Flutter'    # Plugin Pods    # Prepare symlinks folder. We use symlinks to avoid having Podfile.lock   # referring to absolute paths on developers' machines.   system('rm -rf .symlinks')   system('mkdir -p .symlinks/plugins')   plugin_pods = parse_KV_file('../.flutter-plugins')   plugin_pods.each do |name, path|     symlink = File.join('.symlinks', 'plugins', name)     File.symlink(path, symlink)     pod name, :path => File.join(symlink, 'ios')   end end  post_install do |installer|   installer.pods_project.targets.each do |target|     target.build_configurations.each do |config|       config.build_settings['ENABLE_BITCODE'] = 'NO'     end   end end

Answer 1

I got this error when I updated my flutter sdk to the new flutter 2.0, but my project was created with older version of flutter sdk (1.22).

Fixed It by deleting the Podfile and Podfile.lock in ios folder and then run:

flutter run 

or

flutter build ios 

That way flutter will generate the new Podfile for flutter 2.0