Xcode 'Build Failed' With No Clear Error

How to fix it

Try these in order — the most common fix is first.

1. 1. Clean the build folder

   Copy steps
   1. Product > Clean Build Folder (Shift-Cmd-K)
   2. Build again
   Did this fix it? Yes No

2. 2. Reset packages

   Copy steps
   1. File > Packages > Reset Package Caches
   2. File > Packages > Resolve Package Versions
   Did this fix it? Yes No

3. 3. Delete DerivedData

   1. Quit Xcode, delete the project's DerivedData folder, reopen
   Did this fix it? Yes No

4. 4. Open the right file

   Copy steps
   1. With CocoaPods, open the .xcworkspace and not the .xcodeproj
   2. Run pod install again after changing Xcode versions
   Did this fix it? Yes No

5. 5. Read the first error

   1. Open the Report navigator, select the failed build and expand the first red error; later errors are often follow-ups
   Did this fix it? Yes No

Symptoms

Build fails with vague errors, 'Command SwiftCompile failed', missing modules, or errors that disappear after a restart.

Why it happens

• Stale build products or module cache
• Swift package resolution out of sync
• CocoaPods or workspace opened incorrectly
• Xcode and Swift version mismatch with dependencies

This guide also covers

• xcode build failed
• xcode command swiftcompile failed
• xcode clean build folder not working

Other Xcode errors

• Xcode Simulator Not Launching or Won't Boot
• Xcode 'Unable to Install' App Error
• Xcode 'No Profiles Found' Code Signing Error
• Xcode 'Failed to Register Bundle Identifier' Error
• Xcode Indexing Stuck or Taking Forever
• Xcode Doesn't Show My iPhone (Device Not Detected)
• Xcode Taking Too Much Storage (How to Free 50GB+)
• Xcode SwiftUI Preview Not Working or Crashing