I made an image in Paint.NET to start making GUIs and such, but I can't seem to figure out why it's not showing up. I opened the GUI editor, and parented a GuiBitmapCtrl to the window, and when I typed the location of the image in, nothing showed up.
Here's the image:

It's saved as a png, has a size of 388 x 120. I thought maybe I was just typing it wrong, but then I put "base/client/ui/loadingBG" and it showed up. Does anyone know how to fix this?