Wanted to use my ps4 controller on my pc to play a game. There's a program called scp toolkit to install appropriate device drivers for those controllers. The program provides a list of available usb devices currently connected, for which to install the drivers. Unfortunately the devices listed by scp have slightly cryptic names, which means you have to find out, which one it is you're looking for. I chose a usb device for installation I was convinced was the controller. Little did I know that the following NullPointer error made my keyboard unusable. 🙃