Im unable to login in frappe hr mobile app

I Installed the Frappe hr app on my mobile phone but I’m unable to login I’m getting login error although I am using the correct credentials
What Steps are to be followed to use the Frappe hr mobile app

Because the user you login to, checks if the user is linked to the employee or not. If it is linked to employee, you can login from mobile app. If it is not a user link then cannot login.