Diagnosing "PhaseScriptExecution failed with a nonzero exit code" in Xcode

Encountering the error message "PhaseScriptExecution failed with a nonzero exit code" in React Native can be frustrating, especially since it is quite generic and can be caused by a multitude of reasons. However, the most important step in resolving this issue is to gather more information about the error.

Understanding the Error

The error message "PhaseScriptExecution failed with a nonzero exit code" indicates that a script executed during the build phase of your React Native project has failed. This script could be anything from a custom build script to a CocoaPods-related script, or even a script run by React Native itself.

Accessing Detailed Error Information

The best way to get more information about the error is by using Xcode’s built-in report navigator. Here’s how to access it:

1. Navigate to Reports: Go to View > Navigators > Reports. Alternatively, you can use the keyboard shortcut CMD + 9 to quickly open the Reports navigator.

2. Locate the Error: In the Reports navigator, find the build that failed. You can see detailed logs of the build process, including the exact script that failed and any error messages or output it produced

   

   In Xcode you will see error "PhaseScriptExecution failed with a nonzero exit code" (in red), but above that (in blue), you will see the real error that causing the build issue.

   

Conclusion

The "PhaseScriptExecution failed with a nonzero exit code" error can be daunting due to its generic nature, but by accessing detailed error information through Xcode’s Reports navigator, you can pinpoint the exact cause and understand why the script is failing. This article is not about fixing the problem, but rather about gathering the necessary information to diagnose the issue. Once you have this information, you will be better equipped to address and resolve the underlying problem.