Found A Bug-Cannot Use Slider

So I just Downloaded the Pro version about an hour ago and already I’m experiencing problems. I deactivated the Lite version, installed and activated the Pro, uploaded my images and updated all my settings and then I tried to activate the widget (I’m using the Nameless theme) and place it in my Responsive Slider Area and…there is no way to select your slider. The box (under select your slider name and hit save button) is completely blank. I don’t understand why this worked perfectly in the Lite vers but now the Pro vers doesn’t work at all. So now I have no slider. I’ve tested it in 3 different browsers and it’s always the same.

Does anyone know how to fix this? Or if it can be fixed? Or should I ask for a refund?

https://ww.wp.xz.cn/plugins/image-slider-widget/