There is no workflow interruption quite as jarring as a failing iOS build. You wait for the compiler to churn through thousands of files, only to be stopped dead by the dreaded red stop sign: "Command PhaseScriptExecution failed with a nonzero exit code." Unlike syntax errors, this error provides almost no immediate context. It doesn't point to a line of Swift or Objective-C code. It simply means a shell script running during your build process crashed. Whether you are a native iOS engineer or a React Native/Flutter developer, this guide dissects the root causes of this error and provides the specific, verified fixes for Xcode 16+ and Apple Silicon environments. The Root Cause: What is PhaseScriptExecution? In Xcode, the "Build Phases" tab controls the assembly line of your application. While some phases are standard (Compile Sources, Link Binary), others are custom shell scripts. These scripts handle tasks like: CocoaPods: Embedding framework resources. Re...
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