Waiting for another flutter command to release the startup lock
这个报错是我第二次碰到，它的解决方案网上都有提到，就是删除 Flutter lockfile
echo $PATH
大部分情况下，我们的 Flutter 都是配置了环境变量，从如上命令打印结果中找到 Flutter。
/Users/***/Applications/flutter/bin
如果是 Mac 用户，也可以用 which 命令
which flutter
Win 用户那就用 where
where flutter
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