How to fix this nullOk error when using the flutter_svg package?

问题

I connected the package, added it to main.dart, I try to compile the application, but I get this error. Help! What should I do about it?

error

Launching lib\main.dart on XT1562 in debug mode...
Running Gradle task 'assembleDebug'...
/D:/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_svg-0.18.1/lib/src/picture_provider.dart:50:59: Error: No named parameter with the name 'nullOk'.
        context != null ? Localizations.localeOf(context, nullOk: true) : null,
                                                          ^^^^^^
/D:/flutter/packages/flutter/lib/src/widgets/localizations.dart:413:17: Context: Found this candidate, but the arguments don't match.
  static Locale localeOf(BuildContext context) {
                ^^^^^^^^


FAILURE: Build failed with an exception.

* Where:
Script 'D:\flutter\packages\flutter_tools\gradle\flutter.gradle' line: 991

* What went wrong:
Execution failed for task ':app:compileFlutterBuildDebug'.
> Process 'command 'D:\flutter\bin\flutter.bat'' finished with non-zero exit value 1

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 15s
Exception: Gradle task assembleDebug failed with exit code 1

回答1:

Follow the steps below

add the following dependency

  flutter_svg: ^0.20.0-nullsafety.3

run flutter clean command
run flutter pub get command
run flutter run command or run the project

回答2:

The problem is that the version of Flutter with null-safety enabled (currently on the beta channel as of writing), the nullOk parameter was removed Localizations.localeOf, but you're using a package (in this case, flutter_svg) that is still using nullOk.

If you're using the null-safe version of Flutter, you should use null-safe versions of other packages too, if available. Alternatively you can stick with the latest version of Flutter without null-safety (version 1.22.x) until all of your dependent packages have been migrated for null-safety.

来源：https://stackoverflow.com/questions/66144283/how-to-fix-this-nullok-error-when-using-the-flutter-svg-package

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