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Command PhaseScriptExecution failed with a nonzero exit code in Flutter: Causes and How to Fix

February 10, 2025

Discover causes and solutions for the "Command PhaseScriptExecution failed with a nonzero exit code" error in Flutter with our comprehensive guide.

What is Command PhaseScriptExecution failed with a nonzero exit code Error in Flutter

 

Understanding Command PhaseScriptExecution Failed Error in Flutter

 

  • The "Command PhaseScriptExecution failed with a nonzero exit code" error indicates an issue during the build process in Flutter, where a script execution phase returns an error status, usually indicating an underlying script failure.

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  • This error commonly arises during the Xcode build process when deploying a Flutter project to iOS, often related to shell/command scripts defined in the Xcode project settings.

 

Interpreting the Error Message

 

  • The error message typically provides a path to the script or phase in question, allowing you to pinpoint where the issue occurs within your project's structure.

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  • Understanding the content and context of the script and its purpose in the build pipeline is essential for delving deeper into potential root causes.

 

Example: Script Reference in Build Log

 

PhaseScriptExecution [CP-User] /Users/username/Library/Developer/Xcode/DerivedData/MyApp-bxqogqrlosghziabcaoegmjwembd/Build/Intermediates.noindex/MyApp.build/Debug-iphonesimulator/Runner.build/Script-XXXXXXX.sh

 

Impact on Development Workflow

 

  • This error prevents successful project compilation and halts any further builds, significantly impacting development and testing cycles.

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  • Resolving this involves examining the script, correcting any errors, and ensuring configurations match expected parameters within the build system.

 

Common Scenarios for Encountering This Error

 

  • Build scripts or post-processing scripts in Xcode projects might not find specific environment configurations or paths necessary for execution.

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  • The scripts might have syntax errors, incorrect permissions, or dependencies that lead to failure when the build is triggered.

 

Resources for Further Exploration

 

  • Consult Flutter and Xcode documentation or community forums to understand expected script behaviors and share experiences regarding similar errors.

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  • Explore CI/CD configurations if automated builds are in use, as varying environments might manifest this issue differently.

 

flutter clean
flutter pub get

What Causes Command PhaseScriptExecution failed with a nonzero exit code in Flutter

 

Causes of Command PhaseScriptExecution Failed with a Nonzero Exit Code in Flutter

 

  • Script Errors: If there's an error within the scripts that are being executed, such as syntax errors or logical errors, the script will fail. These scripts usually deal with running build tasks, running scripts, or commands.

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  • Permission Issues: Scripts sometimes require specific permissions to execute certain tasks. If the necessary permissions are not granted, the script execution process will fail with a nonzero exit code.

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  • Unsupported Flutter/Dart Versions: When incompatible versions of Flutter or Dart are used during the build process, it can lead to command execution failures.

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  • Incorrect Script File Path: If the script path used in the build phase is incorrect or the script file doesn't exist at the specified path, the execution will fail. Make sure all paths are correctly configured.

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  • Dependency Conflicts: Conflicting dependencies specified in the project might cause build scripts to fail. This can occur if two or more packages require different versions of a dependency that are not compatible with each other.

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  • Shell Environment Issues: The scripts might rely on specific environment variables or shell configurations that are not properly set up. Missing or incorrect environment configurations can prevent scripts from executing successfully.

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  • Resource Limitations: Inadequate system resources (such as memory or disk space) during script execution can lead to failure if scripts cannot complete their intended operations within the allocated resources.

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  • Misconfigured Build Settings: Incorrect build configurations or settings within the project setup can cause failures. Parameters such as target architectures, build modes, or other build settings play a crucial role.

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  • Code Signing Issues: If the project involves code signing and there are issues with the certificates or provisioning profiles being used, it can halt the build process.

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  • Inconsistent File Encoding: Scripts that include files with inconsistent or incorrect encodings might fail, especially if they rely on specific encoding formats.

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flutter build ios

 

How to Fix Command PhaseScriptExecution failed with a nonzero exit code in Flutter

 

Checking Flutter and Xcode Versions

 

  • Ensure that your Flutter SDK and Xcode are updated to the latest versions. Keeping both the SDK and your development environment up to date can prevent compatibility issues and errors.

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  • Run the following command in your terminal to update Flutter:

 

flutter upgrade

 

Cleaning the Build

 

  • Sometimes cached files might cause conflicts which lead to a non-zero exit code. Cleaning the build might resolve this issue.

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  • Clear Flutter's build cache by running:

 

flutter clean

 

  • Also, clean the Xcode build cache by opening the `ios` folder and running:

 

cd ios
xcodebuild clean

 

Updating CocoaPods and Dependencies

 

  • Ensure CocoaPods is updated to avoid compatibility issues. Update Cocoapods by running:

 

sudo gem install cocoapods
pod setup

 

  • Inside your `ios` folder, update the dependencies:

 

pod install
pod update

 

Adjusting iOS Deployment Target

 

  • Sometimes, the deployment target specified in Xcode doesn't match the minimum required by your dependencies. Adjust this by opening the `ios/Podfile` and ensuring the deployment target is set correctly:

 

platform :ios, '10.0'

 

  • After making changes, run `pod install` again to apply them.

 

Checking the Script Phase in Xcode

 

  • Open `ios/.xcworkspace` in Xcode.

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  • Go to the project settings and navigate to the "Build Phases" tab.

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  • Look for "Run Script" sections and check if there are any scripts causing the failure. Scripts might need modification or debugging.

 

Reviewing Environment Variables

 

  • Ensure that your environment variables are correctly set. This is especially relevant if your build process depends on variables like `PATH` or `FLUTTER_ROOT`.

 

echo $FLUTTER_ROOT
echo $PATH

 

Increasing Xcode's Build Timeout

 

  • If the build process exceeds the default build timeout, increase it by setting a higher value.

 

defaults write com.apple.dt.Xcode IDEBuildOperationMaxWorkerCount N

 

N should be replaced with a sufficient limit based on your system's resources.

 

Rebuilding the iOS Simulator

 

  • Sometimes the simulator might be in a bad state. Rebuilding could resolve this:

 

cd ios
arch -x86_64 xcrun simctl shutdown all
arch -x86_64 xcrun simctl erase all

 

Conclusion

 

  • If all else fails, consider creating a new Flutter project and copying your `lib`, `test`, and other custom directories over. Set up your dependencies afresh. This can often reveal the source of the error and resolve hidden issues caused by misconfigurations.