Cannot run with sound null safety because dependencies don"t support null safety

Cover Image for Cannot run with sound null safety because dependencies don"t support null safety
Matheus Mello
Matheus Mello
published a few days ago. updated a few hours ago

Title: Solving the Incompatibility Issue with Sound Null Safety and Dependencies

Introduction: Hello tech enthusiasts! 👋 Are you facing an issue where you cannot run your Flutter application with sound null safety because some of your dependencies do not support null safety? 😕 Don't worry! In this blog post, we will tackle this common problem and guide you through easy solutions. So, let's dive in and get your app up and running smoothly! 🚀

💥 The Problem: Imagine this scenario: you have followed all the steps to enable null safety in your Flutter application as mentioned on dart.dev. You eagerly run your app with flutter run, only to be met with an error message stating that certain dependencies do not support null safety. 😱 This can be frustrating, especially because you want to take advantage of non-nullable by default (NNBD) right away. But don't despair, we've got your back! 💪

🔧 The Solution: To tackle this issue, follow these simple steps:

  1. Check for Compatible Versions: First, refer to the error message and identify the dependencies that are currently incompatible with null safety. In our example, these are cloud_firestore_web, firebase_core_web, shared_preferences, url_launcher_web, firebase_auth, http, and provider.

  2. Upgrade Dependencies: Visit each dependency's official documentation or its corresponding package page on pub.dev. Look for any updates or announcements regarding null safety support. Ideally, you want to upgrade to a version that supports null safety. If no such version is available, look for alternative packages that offer null safety compatibility.

  3. Update pubspec.yaml: Once you find suitable versions or alternative packages, open your app's pubspec.yaml file. Update the version numbers or package names for the incompatible dependencies accordingly. For example:

dependencies:
  cloud_firestore_web: ^1.0.1  # Replace with a version that supports null safety
  firebase_core_web: ^1.0.2    # Replace with a version that supports null safety
  shared_preferences: ^2.0.0  # Replace with a version that supports null safety
  url_launcher_web: ^2.0.1     # Replace with a version that supports null safety
  firebase_auth: ^3.0.0        # Replace with a version that supports null safety
  http: ^1.0.0                 # Replace with a version that supports null safety
  provider: ^5.0.0             # Replace with a version that supports null safety
  1. Run flutter pub get: After updating the dependencies in your pubspec.yaml file, save the changes and run flutter pub get in your project directory. This command will fetch the updated packages and resolve any missing dependencies.

  2. Test Your Application: Finally, run your Flutter application again using flutter run or your preferred method. Now, the incompatibility with sound null safety should be resolved, and your app will run seamlessly! 🎉

📣 Call-to-Action: We hope this guide has helped you overcome the incompatibility hurdle between sound null safety and your dependencies. We understand how frustrating it can be when you're eager to take advantage of NNBD in your Flutter project. So, let us know in the comments below if you found this blog post helpful or if you have any additional questions. We're here to assist you! 😊

Remember, sharing is caring! If you found this article valuable, don't forget to share it with fellow Flutter developers who might be facing the same issue. Together, we can create a stronger tech community! 💪

Happy coding! 💻🚀


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