Software⏱️ 2 min read📅 2026-05-31

How to Fix: BUG! exception in phase 'semantic analysis' in source unit '_BuildScript_' Unsupported class file major version 61 on Apple Arm

Flutter project error on Apple Silicon Mac

Quick Answer: The issue is caused by the unsupported class file major version 61. Try updating Flutter to the latest version or using a different build tool like Gradle.

📋 Table of Contents

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

The error you're encountering is due to the unsupported major version of the Java class file (61) on Apple Arm. This issue arises because Android Studio Canary 2020.3.1.22 uses a newer version of Java than what's supported by Flutter.

✅ Best Solutions to Fix It

Method 1: Update Java Version

  1. Step 1: Open the Terminal and run brew upgrade --force java to update Java.

Method 2: Use a Different SDK Version

  1. Step 1: Open the Flutter project in Android Studio and go to Settings >Build, Execution, Deployment >Compiler.

💡 Conclusion

By following these steps, you should be able to resolve the error and successfully run your Flutter app on Apple Silicon(ARM) Mac.

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