It's not reading your SD. That's why HBL won't load.
@Jax_Ripper
The guides we recommend on here do a much better job at explaining what it is that you are actually doing. There is no "plug n play" hack for Wii U. That's why you should never follow a guide that just simply gives you a bundled file package and then gives you step by step with no explanation.
There are currently more than 3 different custom firmware options, two different entry points supported and many different ways to customize your homebrew experience. We try and educate users on what they are doing then let them make an informed decision on which hack works for their situation. There is not a "one size fits all" solution when it comes to Wii U Hacking and any guide that says that is just plain wrong.
We get users on these forums all the time begging for help because they followed a YouTube guide or one on Wiihacks and have no idea why they screwed up something or how to fix it.
Plus you wrote a "complete" Wii u softmod guide and you don't even know what CBHC is? I'd be hesitant to follow that guide (what else did you leave out) did you make a nand backup section? Nope didn't think so. That explains a lot.