Userscript Wanikani SRS level progress isn't working

I just downloaded the SRS level progression userscript by hitechbunny and it’s currently not working. I checked the console and it looks like it’s cause it’s failing to generate an API Key, but I don’t know why and I don’t know how to fix it

This? That says unsupported?

Gosh darnit, I always miss the most obvious things. Thanks man