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How to Resolve Build Failed with an Exception in Flutter Firebase Projects

A comprehensive guide to troubleshoot and solve the `Build failed with an exception` error in your Flutter Firebase application. --- This video is based on the question https://stackoverflow.com/q/65488777/ asked by the user 'Ansh Rathod' ( https://stackoverflow.com/u/14871034/ ) and on the answer https://stackoverflow.com/a/70904011/ provided by the user 'Vaidehee Vala' ( https://stackoverflow.com/u/11884099/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions. Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: FAILURE: Build failed with an exception.in flutter firebase Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l... The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license. If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com. --- Troubleshooting Build Failed Errors in Flutter Firebase As a beginner in Flutter app development, encountering errors can be overwhelming, especially when the build fails with an exception related to Firebase integration. One common issue is the failure associated with the multidex configuration, which typically arises if your application exceeds the 64K method references limit that Android enforces. This guide will help you understand why this happens and how to fix it effectively. Understanding the Problem The error message suggests that your application has exceeded the maximum number of method references in a .dex file. When you defined your app's dependencies, you might have included libraries that, when combined, resulted in a count of method references that surpasses the Android limit. Key points related to the error: The Could not find method multidexEnabled() error indicates there's a problem with the multidex configuration in your build.gradle file. The message Cannot fit requested classes in a single dex file highlights the need to enable multidex in your application. Solution: Enable MultiDex Support To resolve this issue, you need to enable MultiDex in your app-level build.gradle file. Here’s how you can do it step by step: Step 1: Locate the build.gradle File Navigate to your project directory and find the app/build.gradle file, which contains important configurations for your Android app. Step 2: Edit the defaultConfig Section Inside the defaultConfig block of your build.gradle file, you need to enable multidex support. Here’s what you should add: [[See Video to Reveal this Text or Code Snippet]] Ensure that your minSdkVersion is set to 16 or higher, as lower versions do not support multidex. Step 3: Modify Dependencies If you haven't already, you'll need to include the MultiDex dependency in the same build.gradle file under the dependencies section: [[See Video to Reveal this Text or Code Snippet]] This line adds MultiDex functionality to your application. Step 4: Update Your Application Class (If Needed) If your app's minSdkVersion is less than 21, you will also need to create a custom Application class to handle MultiDex. You can do this by creating a new Java or Kotlin file in your project: [[See Video to Reveal this Text or Code Snippet]] Don't forget to register this application class in your AndroidManifest.xml: [[See Video to Reveal this Text or Code Snippet]] Conclusion After making these changes, try rebuilding your Flutter project using the command: [[See Video to Reveal this Text or Code Snippet]] By enabling MultiDex support, you should be able to resolve the Build failed with an exception error efficiently. This solution will allow your application to manage a larger number of method references without running into dex file limitations. Feel free to reach out if you have additional questions or run into further issues. Happy coding!