WiiSX can't load from USB or SD

I'm having trouble getting it to work right, I have the .iso on both my SD card and USB in the correct folder, yet when I try to load from either I get 'Error opening directory "sd:/wiisx/isos"' and 'Error opening directory "usb:/wiisx/isos"'

what am I doing wrong? Is something not installed properly?

Your SD card may not be set up properly; make sure you have a "wiisx" folder on your card (or usb drive) that is not in any folders. Inside the "wiisx" folder you should have an "isos" folder. Then inside the "isos" folder then you have your iso files.

If that's not it, try this version: [forum.wiibrew.org]