Causation:
You haven’t installed the Wireless Network Adapter or it is disabled when you are processing WiFi hotspot.
Solution:
Laptop user: Re-run WiFi Hotspot firstly. If the pop-up window above still appears, then you must install the Wireless Network Adapter and Driver.
PC user: If you haven’t installed the Wireless Network Adapter, you have to install the USB Wireless Network Adapter to use WiFi Hotspot function.