This is my config in init.el:
(setq projectile-completion-system 'helm)
(setq projectile-indexing-method 'alien)
(setq projectile-switch-project-action 'helm-projectile-find-file)
I was told "Find: incorrect argument formatting" and failed to list any file when used 'helm-projectile-find-file'. I found that this error tips was produced by “find.exe”. However, this command works normally in a project which is considered project by default.