flutter_test from sdk is forbidden?

报错信息:

Because every version of flutter_test from sdk depends on collection 1.14.11 and flutter_app depends on collection 1.14.6, flutter_test from sdk is forbidden.
So, because flutter_app depends on flutter_test any from sdk, version solving failed.

collection 版本不一致,修改依赖:
pubspec.lock(pub文件)下找到collection,黏贴以下代码(版本选择可以自己定义)

 collection:
      dependency: transitive
      description:
        name: collection
        url: "https://pub.dartlang.org"
      source: hosted
      version: "1.14.11"

在.yaml文件里,dependencies下,与上面保持一致

collection: ^1.14.11

Packages get 如果报:

Expected a key while parsing a block mapping.
   collection:
   ^

可不用管,直接run就好。
如果报SDK版本冲突,把对应的依赖,按照上面的collection的操作依赖,版本升级就好,如果不知道最新版本是多少,安利一波:flutter各种依赖

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