What is Unable to Complete Touch ID Setup Error?

When you go to "Touch ID & Passcode" its looks like you have never set a touch ID before, when you try to make a new fingerprint it says “Failed unable to complete Touch ID setup Please go back and try again." You may get this error when the Touch ID has failed since updating to the latest IOS. From this error, you cannot use Touch ID to unlock the app. This Unable to Complete Touch ID Setup error includes the complete failure of Touch ID