[SOLVED] Could not find an option named "no-sound-null-safety" in Flutter

Tari Ibaba
Last updated on November 21, 2023
[SOLVED] Could not find an option named "no-sound-null-safety" in Flutter

Are you experiencing the "Could not find an option named no-sound-null-safety" error in Flutter?

The "Could not find an option named no-sound-null-safety" occurring in VS Code.
The "Could not find an option named no-sound-null-safety" occurring in VS Code.

We're going to learn how to easily fix it in this article.

What causes the "Could not find an option named no-sound-null-safety" error?

The "Could not find an option named no-sound-null-safety" happens in a newer Flutter project using Dart 3.0, because Dart no longer supports unsound null safety.

Unsound null safety was a special Dart/Flutter feature where there are no static checks to ensure that we don't access nullable variables - variables that may be null.

It allowed developers to migrate their codebase to the default null safety gradually without breaking existing code that depended on null-unsafe libraries.

But from version 3.0 upwards, Dart only supports code using sound null safety.

Fix "Could not find an option named no-sound-null-safety" (general)

To fix the "Could not find an option no-sound-null-safety" Flutter error, remove the --no-sound-null-safety option in your flutter run command.

The "Could not find an option named no-sound-null-safety" occurring in the command line.

Fix "Could not find an option named no-sound-null-safety" in VS Code

To fix the error in Visual Studio Code remove the --no-sound-null-safety option in the Dart: Flutter Additional Args setting.

You can use the Ctrl + , keyboard shortcut to quickly open the Settings page.

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