我正在尝试为我正在处理的现有 Symfony 项目安装依赖项。我看了这个https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file它说我应该运行更新命令：php composer.phar update。我这样做了，但出现以下错误：
Your requirements could not be resolved to an installable set of packages.
Problem 1
- phpro/grumphp[v0.12.0, ..., v0.12.1] require composer-plugin-api ~1.0 -> found composer-plugin-api[2.1.0] but it does not match the constraint.
- Root composer.json requires phpro/grumphp ^0.12 -> satisfiable by phpro/grumphp[v0.12.0, v0.12.1].
似乎需要 Composer 1。尝试删除供应商文件夹并降级 Composercomposer self-update --1。比跑composer install or composer update again.
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