Flutter Null Safety issue

Question

This application is not configured to build on the web. To add web support to a project, run flutter create .. Launching lib\main.dart on Chrome in debug mode... Waiting for connection from debug service on Chrome... Error: Cannot run with sound null safety, because the following dependencies don't support null safety:

package:flutter_speed_dial

For solutions, see https://dart.dev/go/unsound-null-safety Unhandled exception:

Does this answer your question? Cannot run with sound null safety because dependencies don't support null safety — ibhavikmakwana
– ibhavikmakwana, Commented Feb 22, 2022 at 12:20

nvoigt · Accepted Answer · 2022-02-22 12:20:07Z

2

You will need at least version 3.0.0 of that package to have null safety.

Given that they are at version 5.0.0 right now, you should probably update your packages every once in a while.

answered Feb 22, 2022 at 12:20

nvoigt

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2 Comments

toronto1109tn Over a year ago

how could I upgrade it

nvoigt Over a year ago

Since you seem to have missed 2 major version changes, you edit the pubspec.yaml file to the version you want and then run flutter pub get

Dev Hingu · Accepted Answer · 2022-02-22 19:12:48Z

If you want to run without latest version you need to Update the Configuration File,

Edit Configuration

Then,

Add --no-sound-null-safety in Additional run args.

Add Command in Additional run args

Then, Click Apply and Run the app.

Zeel Patel · Accepted Answer · 2022-02-23 13:11:30Z

Edited:

you will need to latest version and if you want to run without latest version you need to run this command

$ flutter run --no-sound-null-safety

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