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Discover how to fix the error related to source sets in Kotlin after updating the Android Studio Kotlin plugin. Learn effective methods and best practices.
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Resolving the Build Failed with Exception Error in Kotlin on Android Studio

If you've recently updated the Kotlin plugin in Android Studio and found yourself faced with a perplexing error during your build process, you're far from alone. One common issue developers encounter is the Build failed with an exception: SourceSet with name 'main' not found. In this guide, we’ll explore the reasons behind this error and guide you through the steps to resolve it effectively.

Understanding the Error

The error message you receive is not merely a random occurrence—it indicates that the project configuration is misaligned with how Android applications operate. Specifically, Android apps do not utilize a traditional main function to run their code, unlike standard Kotlin applications. Instead, they rely on the Android lifecycle to execute code within the context of Activities, Fragments, and Services.

What the Error Message Means

Here's the essence of the error message:

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This error suggests that the project is expecting a main source set, which is not applicable to Android projects.

Steps to Resolve the Issue

Don't worry; the solution is straightforward. Below are steps you can follow to fix the error and get your project back on track.

1. Change Your Project Structure

Since Android applications do not have a traditional main method, you will need to reconfigure your project structure. The simplest way to run Kotlin code in an Android app is by creating a new Kotlin module. Here’s how:

Open your project in Android Studio

Navigate to File → New Module

Choose Kotlin Library

Follow the prompts to create your new module

Move your Kotlin code, including the main function, to this module

2. Modifying the build.gradle Files

Make sure that your build.gradle files are correctly set up. Here’s a consolidated view of what your build.gradle (app) file should look like:

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3. Verify Kotlin Version

Ensure your Kotlin version in your project files is consistent. If you've updated the plugin, make sure your Kotlin version is appropriately set in your build.gradle (project) file:

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4. Clean and Rebuild the Project

Sometimes, the simplest solution can be the most effective. After making your changes, it is essential to clean and rebuild the project:

Navigate to Build → Clean Project

Next, click on Build → Rebuild Project

5. Additional Tips

Invalidate Caches/Restart: If issues persist, try to invalidate caches by going to File → Invalidate Caches / Restart....

Update Dependencies: Ensure all your dependencies are up-to-date by checking the version numbers and updating them if necessary.

Conclusion

By following these steps, you should be able to resolve the Build failed with exception error related to your Kotlin project in Android Studio. Remember, this error primarily arises from misunderstandings of how Android applications function relative to standard Kotlin applications. With the right adjustments, you can have your project running smoothly once again.

Happy coding!