Software⏱️ 2 min read📅 2026-06-03

How to Fix: FBSOpenApplicationErrorDomain code =4 error

FBSOpenApplicationErrorDomain code =4 error in Xcode 6 iPhone 6 simulator.

Quick Answer: Try updating Xcode to the latest version and ensure that the iOS SDK is properly installed.

📋 Table of Contents

  1. 💡 Best Solutions to Fix It
  2. 💡 Conclusion

The FBSOpenApplicationErrorDomain error code 4 indicates a problem with launching the iOS application in Xcode 6 on an iPhone 6 simulator. This issue can be caused by various factors, including outdated or incompatible software versions, incorrect simulator settings, or issues with the application itself.

💡 Best Solutions to Fix It

  • Update Xcode and iOS simulator versions to the latest available versions.

Method 1: Update Simulator

  1. Step 1: Open Xcode and go to Product >Destination.

Method 2: Clean Build Folder and Restart Simulator

  1. Step 1: Locate the Xcodeproj folder in your project directory, then delete it.

💡 Conclusion

By following these steps and ensuring that all software versions are up-to-date, you should be able to resolve the FBSOpenApplicationErrorDomain error code 4 issue and successfully run your iOS application in Xcode 6 on an iPhone 6 simulator.

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