A simiar question has been asked in Linux and been solved: pcapy.findalldevs() No valid interfaces to open
But I have this problem when I tried to run python network_monitor.py in Windows. Do I need to get the special rights in Windows? If so how to I get it as we use sudo in Linux?
Try right clicking the command prompt icon in the start menu or equivalent Windows 10 menu and clicking "Run as Administrator." Then run network_monitor.py from that prompt.