pothos rtlsdr_get_device_usb_string failed.

I got the message: pothos rtlsdr_get_device_usb_string failed
when using the example file : simple_fm_demod.pothos 
with PothosWare - Pothos SDR flow on MS Windows 10 on a Asus VivoBook working with a RTLSDR v4 USBstick

As a SDR noob, I do not know what is wrong or how to solve it.
Therefore any help/advise/tips are all welcome