Hi, sorry that I forgot to mention I did remove the -- line to enable arguments where it tells me to as blackbOx described
I still got the same error
is there anything else I should change in the loader?
Your hdd is formatted as fat32 right? You've tried both usb ports on the wiiu? You can try a Y-cable (splitter cable) so your hdd can get power from 2 USB ports. Or you can try a different hdd. Are using using an external hard drive or a small USB flash/thumb drive?
Flash drives generally have poor compatibility. You can maybe improve compatibility by formatting it as wbfs using wii backup manager, instead of fat32. You lose many of the benefits of fat32, but it may get it working for u.
Better to just use a compatible hard drive (not a thumb drive) if possible