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Encountering a `PlatformException` error while logging in to your Flutter app? Discover the simple fix to this common Flutter issue and get your app back on track!
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This video is based on the question https://stackoverflow.com/q/66541237/ asked by the user 'Kevnlan' ( https://stackoverflow.com/u/6593226/ ) and on the answer https://stackoverflow.com/a/66566651/ provided by the user 'Taif Raoof' ( https://stackoverflow.com/u/4782102/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Resolving PlatformException Errors in Your Flutter App's Login Process

Flutter is an excellent framework for building cross-platform applications, but like any other technology, it can come with its own set of challenges. One common issue that developers face is the dreaded PlatformException error during the login process. If you’ve encountered the message below while trying to log in to your app, you’re not alone and fortunately, there’s a straightforward solution to the problem.

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This error generally points to issues with the shared_preferences package that your app may be using. The fact that you need to hit F5 to continue indicates that it isn’t simply a minor error; it’s a recurring problem that crimped the smooth execution of your app.

Understanding the Cause

The error stems from the shared_preferences plugin, which is commonly used in Flutter applications to store simple data on the device. When using this library, conflicts can arise depending on the version installed. The specific message we see here relates to a RejectedExecutionException, which typically indicates that asynchronous tasks have become difficult for the system to manage because too many concurrent operations are being requested.

The Solution

The good news is that you can resolve the PlatformException error by changing the version of the shared_preferences package in your pubspec.yaml file. Here are a few steps to guide you through this process:

Step 1: Open Your pubspec.yaml File

Navigate to your Flutter project's root directory.

Open the pubspec.yaml file, where you can manage package dependencies.

Step 2: Modify the shared_preferences Version

To address the issue, you need to downgrade the shared_preferences package version. Follow these points:

Replace the current shared_preferences line in your pubspec.yaml file:

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With:

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This downgrade is critical as using caret ^ allows for major updates that can cause the PlatformException error you are experiencing.

Step 3: Clean and Upgrade Your Packages

Once you’ve modified the version number, follow these additional steps to apply the changes:

Run the command to clean up the project and ensure that no previous artifacts are causing issues:

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Next, fetch the new dependencies:

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Step 4: Test Your Application

After applying these changes, try to log in to your Flutter app again. The PlatformException should now be resolved, and you won’t have to press F5 to complete the process.

Conclusion

Dealing with PlatformException errors in Flutter doesn’t have to be a daunting task. By downgrading the shared_preferences package version, you can effectively tackle the issue head-on, creating a more seamless login experience for your users while ensuring that your application functions properly. Happy coding!