helm-projectile-ag cannot find helm-ag

[ccqpein]

Expected behavior

Call helm-ag in this project

Actual behavior

Cannot find helm-ag in helm project, and depended on this. Looks like helm delete helm-ag.

I redefine projectile-ag function in my init file and looks fine.

(defun projectile-ag (arg)
    (interactive "P")
    (helm-grep-ag (projectile-project-root) arg)))