之前创建了项目之后，今天重启了服务器，点击项目URL报错404
谷歌了很多资料，最后觉得靠谱的还是缓存问题，按照下面小哥的方法清了下缓存，就可以了
A gitlab-rake cache:clear solves this issue immediately, so the problem is apparently an incoherent cache.
It is reproducible, a formerly renamed or deleted project triggers the cached 404.
原文的连接如下：
https://gitlab.com/gitlab-com/support-forum/issues/561