Nighthawk AC1900 Wifi Extender not connecting to WiFi

I just moved into a new location where my room is a bit away from the WiFi Router. I am using the Nighthawk AC1900 Wifi Extender that my friend no longer needed. It was working fine for the last few months but for some reason it cut off from my WiFi Router the other day. When I try to use the Netgear Genie to setup the AC1900 Extender and click on the "Use as a Wifi Extender" button, it starts searching for nearby wifi signals and then goes back to the "Set Up New Extender" page.

 I have tried clicking on the "Use as an Access Point" button and setting it up--this works fine; however, I need the extender in my room and I don't have a way to run an ethernet cord there.

Please let me know if there's anything at all I can do to fix this. It would mean a lot to me as high-speed internet is important for my work.