无法正常运行 null 安全，因为以下依赖项 [build\windows\flutter\flutter_assemble.vcxproj]

Question

I have shifted my entire code to latest dart version 2.15.1. Now I am trying to run the code and it is giving this error.

Image 1

Why I am getting this error. Anyone please help me.

Thanks

Answer 1

This is because some of your dependencies that you are using in your project doesn't support null-safety or Your project itself doesn't support null-safety but using dependencies that supports null-safety . To get rid of this problem you can try upgrading the dependency that is causing the error and if there's no update available for that plugin that run your project using below command:

To Run

flutter run --no-sound-null-safety

To Build

flutter build apk --release --no-sound-null-safety

Answer 2

This error comes when your project or package is not supported on null safety
when you are trying to run the project its gives you an error which you see in your picture

if you want to run without null safety use this command

flutter run --no-sound-null-safety

when you hit this command on your project it should be run if you face any error kindly comment

Answer 3

1.Press Run
2.Edit Configurations
3.Add Additional Run args 
4.--no-sound-null-safety

Answer 4

I just ran into this. I tried to build for Windows and got the null-safety error but the output did not say which packages were the problem, it just showed several paths to Visual Studio.

I then tried to build for Chrome and it did list the packages that did not support null-safety. Hope this helps.

Answer 5

in my case i just type the major version avalaible for the dependency and it works: from shared_preferences:

to shared_preferences: ^2.0.16

With the flutter pub update command, it threw me a reference to the shared_preferences dependency and after investigated options I saw this solution and applied it and it worked fine