iOS build error: "Could not determine generated file paths for Core Data code generation"

[KCO-SK]

If you are looking for help, please confirm the following...

• I confirm I have searched the Docs, Codemagic Sample Projects, and GitHub Discussions.
• I confirm the software versions on my local computer match the ones in CI environment (e.g. Xcode version, Gradle version). See here
• I confirm I am able to do a fresh clone of the repository and build the project on my local computer.

Which mobile framework are you using?

Flutter (Dart)

Steps to reproduce

When I compile my Flutter App for iOS through Codemagic then the build fails.

I use the following scripts in my Ci/CD, because before I ran into the errors from https://github.com/orgs/codemagic-ci-cd/discussions/2907 .

Post-clone script:

flutter pub get
flutter gen-l10n

Pre-build script:

flutter clean
flutter pub get

The mentioned "ios/Model.xcdatamodeld" is part of my GitHub files.
I do not see any error in it when looking at it in Xcode.

I guess it has something to do with absolute paths and relative paths, but I do not know how to fix it and didn't find anything about it within the Codemagic documentation.

Expected results

Build succeeds as it does local on Xcode / Android Studio, too:

Actual results

== Building for iOS ==

> flutter build ios --release --no-codesign
Warning: Building for device with codesigning disabled. You will have to manually codesign before deploying to device.
Building de.polipol.PoliAppPublic for device (ios-release)...
Running pod install...                                            142.5s
Running Xcode build...                                          
Xcode build done.                                           15.8s
Failed to build iOS app
Error (Xcode): Could not determine generated file paths for Core Data code generation: The command `(cd /Users/builder/clone/ios && /Applications/Xcode-16.3.app/Contents/Developer/usr/bin/momc --dry-run --action generate --swift-version 5.0 --sdkroot /Applications/Xcode-16.3.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS18.4.sdk --iphoneos-deployment-target 14.0 --module Runner /Users/kuhlemann/StudioProjects/business_app/ios/Model.xcdatamodeld /Users/builder/Library/Developer/Xcode/DerivedData/Runner-edaimyiflreloheqntgnhkmwcclv/Build/Intermediates.noindex/Runner.build/Release-iphoneos/Runner.build/DerivedSources/CoreDataGenerated/Model)` exited with status 1. The command's standard error was:

/Users/kuhlemann/StudioProjects/business_app/ios/Model.xcdatamodeld:: error: Could not fetch generated file paths: No current version for model at path /Users/kuhlemann/StudioProjects/business_app/ios/Model.xcdatamodeld: [0]


Error (Xcode): Could not determine generated file paths for Core Data code generation: The command `(cd /Users/builder/clone/ios && /Applications/Xcode-16.3.app/Contents/Developer/usr/bin/momc --dry-run --action generate --swift-version 5.0 --sdkroot /Applications/Xcode-16.3.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS18.4.sdk --iphoneos-deployment-target 14.0 --module CallerExtension /Users/kuhlemann/StudioProjects/business_app/ios/Model.xcdatamodeld /Users/builder/Library/Developer/Xcode/DerivedData/Runner-edaimyiflreloheqntgnhkmwcclv/Build/Intermediates.noindex/Runner.build/Release-iphoneos/CallerExtension.build/DerivedSources/CoreDataGenerated/Model)` exited with status 1. The command's standard error was:

/Users/kuhlemann/StudioProjects/business_app/ios/Model.xcdatamodeld:: error: Could not fetch generated file paths: No current version for model at path /Users/kuhlemann/StudioProjects/business_app/ios/Model.xcdatamodeld: [0]


Encountered error while building for device.


Build failed :|
Failed to build for iOS

Build id (optional)

68272c9645a94079f8cc6b95

[KCO-SK]

I hoped changing the path in my Runner.xcodeproj > project.pbxproj with Visual Studio Code would help by changing the path to path = "Model.xcdatamodeld"; :

But now I run into the following CI error (Build ID 68277246311d3da1daafedc5):

Running Xcode build...
Xcode build done. 3.8s
Failed to build iOS app
Uncategorized (Xcode): Exited with status code 127

Encountered error while building for device.

Build failed :|
Failed to build for iOS

[KCO-SK]

Hey @dtrdic,

I used all of your commands to clean my local cache and also removed the pre-build script entries as you have suggested.

I have no problems building local release versions in Android Studio for iOS (flutter build ios --release --no-codesign) and Android (flutter build appbundle --release), neither before nor after this cleaning.

Nevertheless the Codemagic builds with exactly the same used code still fail:

iOS build ID: 6834a7df69e1230ad995952b

flutter build ios --release --no-codesign
Warning: Building for device with codesigning disabled. You will have to manually codesign before deploying to device.
Building de.polipol.PoliAppPublic for device (ios-release)...
Running pod install... 132.7s
Running Xcode build...
Xcode build done. 4.0s
Failed to build iOS app
Uncategorized (Xcode): Exited with status code 127

Encountered error while building for device.

Build failed :|
Failed to build for iOS

Android build ID: 6834a1c513799bf5ee4d1e71

flutter build appbundle --release
Running Gradle task 'bundleRelease'...
FAILURE: Build failed with an exception.

• What went wrong:
  Execution failed for task ':app:checkReleaseDuplicateClasses'.

Could not resolve all files for configuration ':app:releaseRuntimeClasspath'.
Failed to transform x86_64_release-1.0.0-f43bd5c131fd7baae97c31896004d45f85bde6a7.jar (io.flutter:x86_64_release:1.0.0-f43bd5c131fd7baae97c31896004d45f85bde6a7) to match attributes {artifactType=enumerated-runtime-classes, org.gradle.category=library, org.gradle.libraryelements=jar, org.gradle.status=release, org.gradle.usage=java-runtime}.
> Execution failed for JetifyTransform: /Users/builder/.gradle/caches/modules-2/files-2.1/io.flutter/x86_64_release/1.0.0-f43bd5c131fd7baae97c31896004d45f85bde6a7/d62e317c0f008412701d0565d62f2b0d8b00a2ec/x86_64_release-1.0.0-f43bd5c131fd7baae97c31896004d45f85bde6a7.jar.
> Java heap space

• Try:

Run with --stacktrace option to get the stack trace.
Run with --info or --debug option to get more log output.
Run with --scan to get full insights.
Get more help at https://help.gradle.org.

BUILD FAILED in 9m 53s
Running Gradle task 'bundleRelease'... 594.7s
Gradle task bundleRelease failed with exit code 1

Regarding the Android problem people suggest adding the following 2 lines in gradle.properties, but I do not understand why this should me necessary if building locally works fine:

android.useAndroidX=true
android.enableJetifier=true

[dtrdic]

@KCO-SK the Android part fails because Java heap space error. This usually means that the build failed because your app requires more RAM memory than the current build machine provides.
​
To fix this issue try to increase the Java virtual machine heap size to 5 GB by adding this environment variable
​JAVA_TOOL_OPTIONS: "-Xmx5g"

Or use a Linux instance instead (for Android builds) as it provides more RAM memory than the M2 machine

Regarding ios part
Perhaps you have a script (maybe post_install in Podfile) that calls a tool not available on Codemagic's build machine.
Or perhaps on Xcode > Build Phases > Run Script you've hardcoded a path to a tool located on your machine..
That would explain why it works on your local machine and not on Codemagic

[KCO-SK]

Hi @dtrdic ,

the Android build took 17min to complete, but it at least it works now. Thanks for that!

Regarding iOS:
My Run script in my Build phase looks like this which is "Flutter standard" in my opinion:
/bin/sh "$FLUTTER_ROOT/packages/flutter_tools/bin/xcode_backend.sh" build

My Podfile looks like this, which also seems to be Flutter standard as I have just compared it with a fresh Flutter project (GitHubs markup makes it look a bit strange because of the hashtags):

Uncomment this line to define a global platform for your project

platform :ios, '14.0'

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!

#pod 'FirebaseFirestore', :git => 'https://github.com/invertase/firestore-ios-sdk-frameworks.git', :tag => '8.15.0'

flutter_install_all_ios_pods File.dirname(File.realpath(FILE))
target 'RunnerTests' do
inherit! :search_paths
end
end

post_install do |installer|
installer.pods_project.targets.each do |target|
flutter_additional_ios_build_settings(target)
end
end

I am willing/planning to use the paid version of Codemagic to have a good CI/CD environment, but this will only make sense for me if I am technically able to successfully build iOS and Android builds.

Last failed iOS-build has ID 6835f5bd7001f0d53d9a72dd.

Do you have any further ideas?

[dtrdic]

Hey @KCO-SK, hmm yes your Run script and Podfile look pretty standard, so I’d rule those out as the source of the issue.
Let’s take a step back and revert to the original error..
I mean, the path should still be relative..
path = Model.xcdatamodeld;

Since you manually edited project.pbxproj, perhaps you have a syntax error..
Let's try to update this through Xcode instead:

• Open your .xcodeproj in Xcode
• In the left file tree, locate Model.xcdatamodeld
• Right-click → Delete → choose “Remove Reference” (not “Move to Trash”)
• Drag the actual Model.xcdatamodeld folder from Finder back into the ios group in Xcode. Make sure to select “Create groups”, not “Create folder references”
• Save and commit

Also, double-check that the .xcdatamodeld bundle and all its contents—especially the .xcdatamodel version file and the contents file—are committed to Git and not excluded in .gitignore

[KCO-SK]

Hi @dtrdic,

I followed your instruction regarding Model.xcdatamodeld.
Sadly this didn't help to compile via Codemagic on iOS (local still works).
Build ID 6837274472eac74dde48cb7e: Uncategorized (Xcode): Exited with status code 127

I use the Flutter beta channel locally and in Codemagic if this is of any importance:

Model.xcdatamodeld is for sure inside my GitHub repository (I just visually checked it).

The .gitignore in my project folder looks like this:

Miscellaneous

*.class
*.log
*.pyc
*.swp
.DS_Store
.atom/
.build/
.buildlog/
.history
.svn/
.swiftpm/
migrate_working_dir/

IntelliJ related

*.iml
*.ipr
*.iws
.idea/

VSCode relaxed

#.vscode/

Flutter/Dart/Pub related

**/doc/api/
**/ios/Flutter/.last_build_id
.dart_tool/
.flutter-plugins
.flutter-plugins-dependencies
.pub-cache/
.pub/
/build/

Symbolication related

app.*.symbols

Obfuscation related

app.*.map.json

Android Studio will place build artifacts here

/android/app/debug
/android/app/profile
/android/app/release
/.firebase/
/android/app/.cxx/
/android/.kotlin/

[dtrdic]

When you added the Core Data model, did you do it manually or through Xcode? When following this documentation the default path being created is relative
path = Model.xcdatamodeld;

Keep in mind that Xcode injects Model.xcdatamodel in multiple places inside project.pbxproj, so it’s important to add the model through Xcode and not manually.

Could you try this on a new branch—one where the Core Data model hasn’t been added yet—and follow the same steps as outlined in the documentation?

Also, what versions of Xcode and Flutter are you using locally? Ideally, you should use the same versions locally and on CI. It might also be worth testing with a different Xcode or Flutter version.

[KCO-SK]

Hi @dtrdic,

first of all thank you for all of your ideas!

I found the reason within my project.pbxproj :
There have been two variables with absolute paths which caused the problem: FLUTTER_APPLICATION_PATH and FLUTTER_ROOT

In a fresh Flutter project these variables do not exist.
Don't ask me how they have got into my project, because I am sure I didn't add them manually, but after deleting both variables in DEBUG/PROFILE/RELEASE sections my Codemagic build succeeded and the local build also still works. :-)

Best regards