Android Question Kiosk mode problem

Hi all

I am trying to install an app launcher and set up the device in kiosk mode following the tutorial posted by Erel.
The app installs and runs just fine but I get a problem when I try to run the shell scripts to set the device owner.

I issue the command:

But I get the error:

Error: Unknown admin: ComponentInfo{CompanyName.Launcher/anywheresoftware.b4a.objects.AdminReceiver2}

Click to expand...

Does anyone know where the problem may be?

The device is android 5+ and there are no other admin accounts showing in the device setting.

Thanks in advance.