Does not working faceit ac

When i launch Faceit AC i have this : “You must to exit any games before launching Faceit AC”
So i close CSGO, i try again, the same,
So i close steam and try again, the same,
So i shut down my computer, and the first step i do is launching Faceit AC and one more time the same.
So i desinstall Faceit AC and reinstall it, the same.
I go in my task manager, nothing is open