Flutter error:The following untracked working tree files would be overwritten by merge：_flutter channel stable的时候报错the following untracked

C:\Users\86152>flutter upgrade --force
Upgrading Flutter from G:\flutter...
error: The following untracked working tree files would be overwritten by merge:
        .github/ISSUE_TEMPLATE/1_activation.md
        .github/ISSUE_TEMPLATE/2_bug.md
        .github/ISSUE_TEMPLATE/3_feature_request.md
        .github/ISSUE_TEMPLATE/4_performance_others.md
        .github/ISSUE_TEMPLATE/5_performance_speed.md
        .github/ISSUE_TEMPLATE/6_infrastructure.md
        .github/ISSUE_TEMPLATE/config.yml
        .github/lock.yml
        CODEOWNERS
        PATENT_GRANT
        bin/dart/web/bench_dynamic_clip_on_static_picture.dart.....
 
Updating b593f5167b..8874f21e79
Aborting

切换到Fluuter SDK 目录下，地址栏目输入cmd 依次执行命名

$ git fetch origin

$ git clean -f

$ git reset --hard origin/master

查看是否成功 flutter doctor