title: Command PhaseScriptExecution failed with a nonzero exit code while trying to add Flutter to iOS app
body: <p>I am trying to add flutter to the existing app. So before doing on the production app I tried with brand new Xcode 10 Single View Application. I followed the tutorial here on <a href="https://github.com/flutter/flutter/wiki/Add-Flutter-to-existing-apps" rel="noreferrer">https://github.com/flutter/flutter/wiki/Add-Flutter-to-existing-apps</a> and got stuck after adding the run script in the build phase of my target. It's giving the error:</p>
  
  <p><strong>Error:</strong> </p>
  
  <pre><code>iphoneos/AFEiOS.build
      export TEMP_ROOT=/Users/dhavalkansara/Library/Developer/Xcode/DerivedData/AFEiOS-gctxucyuhlhesnfkbuxfswkozboo/Build/Intermediates.noindex
      export TOOLCHAINS=com.apple.dt.toolchain.XcodeDefault
      export TOOLCHAIN_DIR=/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain
      export TREAT_MISSING_BASELINES_AS_TEST_FAILURES=NO
      export TeamIdentifierPrefix=RQ9BPQCP49.
      export UID=501
      export UNLOCALIZED_RESOURCES_FOLDER_PATH=AFEiOS.app
      export UNSTRIPPED_PRODUCT=NO
      export USER=dhavalkansara
      export USER_APPS_DIR=/Users/dhavalkansara/Applications
      export USER_LIBRARY_DIR=/Users/dhavalkansara/Library
      export USE_DYNAMIC_NO_PIC=YES
      export USE_HEADERMAP=YES
      export USE_HEADER_SYMLINKS=NO
      export VALIDATE_PRODUCT=NO
      export VALID_ARCHS="arm64 arm64e armv7 armv7s"
      export VERBOSE_PBXCP=NO
      export VERSIONPLIST_PATH=AFEiOS.app/version.plist
      export VERSION_INFO_BUILDER=dhavalkansara
      export VERSION_INFO_FILE=AFEiOS_vers.c
      export VERSION_INFO_STRING=""@(#)PROGRAM:AFEiOS  PROJECT:AFEiOS-""
      export WRAPPER_EXTENSION=app
      export WRAPPER_NAME=AFEiOS.app
      export WRAPPER_SUFFIX=.app
      export WRAP_ASSET_PACKS_IN_SEPARATE_DIRECTORIES=NO
      export XCODE_APP_SUPPORT_DIR=/Applications/Xcode.app/Contents/Developer/Library/Xcode
      export XCODE_PRODUCT_BUILD_VERSION=10E1001
      export XCODE_VERSION_ACTUAL=1020
      export XCODE_VERSION_MAJOR=1000
      export XCODE_VERSION_MINOR=1020
      export XPCSERVICES_FOLDER_PATH=AFEiOS.app/XPCServices
      export YACC=yacc
      export arch=undefined_arch
      export variant=normal
      /bin/sh -c /Users/dhavalkansara/Library/Developer/Xcode/DerivedData/AFEiOS-gctxucyuhlhesnfkbuxfswkozboo/Build/Intermediates.noindex/AFEiOS.build/Debug-iphoneos/AFEiOS.build/Script-19DAA30A22C0FB0100A039E2.sh
  
  The path lib/main.dart does not exist
  The path  does not exist
  Command PhaseScriptExecution failed with a nonzero exit code
  </code></pre>
  
  <p>I have tried below things.</p>
  
  <p><strong>My pod file:</strong></p>
  
  <pre><code># Uncomment the next line to define a global platform for your project
  platform :ios, '10.0'
  
  target 'AFEiOS' do
    # Comment the next line if you don't want to use dynamic frameworks
    use_frameworks!
  
    # Pods for AFEiOS
  
    target 'AFEiOSTests' do
      inherit! :search_paths
      # Pods for testing
    end
  
    target 'AFEiOSUITests' do
      inherit! :search_paths
      # Pods for testing
    end
  
      flutter_application_path = '/Users/dhavalkansara/FlutterToNative/AFE_flutter/'
      eval(File.read(File.join(flutter_application_path, '.ios', 'Flutter', 'podhelper.rb')), binding)
  
  
  end
  </code></pre>
  
  <ul>
  <li>Already added <strong>FLUTTER_ROOT</strong> in my project.</li>
  </ul>
  
  <p>Please help me out with this issue.</p>