Flutter酒吧得到给予错误

Running "flutter pub get" in practice...                        
Because every version of flutter_test from sdk depends on quiver 2.1.3 and practice depends on quiver 2.1.0, flutter_test from sdk is forbidden.

So, because practice depends on flutter_test any from sdk, version solving failed.
pub get failed (1; So, because practice depends on flutter_test any from sdk, version solving failed.)
exit code 1

我正在使用的版本

[√] Flutter (Channel dev, v1.18.0, on Microsoft Windows [Version 10.0.18363.752], locale en-IN)
    • Flutter version 1.18.0 at C:\src\flutter
    • Framework revision 8f7327f83a (3 weeks ago), 2020-04-06 22:11:01 -0400
    • Engine revision 49891e0653
    • Dart version 2.8.0 (build 2.8.0-dev.20.0 1210d27678)