user-error Could not find ccls project root

[losper]

ccls已经编译完成，并通过exec执行。
emacs-ccls也通过melpa安装
项目的compile_command.json通过cmake生成，并ln -s 软链接了。
但是打开一个cpp文件后，出现 user-error Could not find ccls project root提示，请问是否还有其他未配置的内容？

[MaskRay]

Can you run M-: (projectile-project-root) RET?

You need some indicator to let projectile know about the project (e.g. .git)

[losper]

Tks for your advice,it worked.