API Error Troubleshooting

Every time I try to change the spells on my sheet I get the same API error.

I did my research on the forum and internet before but every solution hasn't led to a change. I've cleared my cookies multiple times as well as my browser cache, logged in and out, disabled all of my extensions, tried different browsers, tried it on mobile and PC, waited a week and tried again, disabled and re enabled home brew, I even downloaded the app. I still get that API error and can't do anything on the sheet! Any tips would be desperately appreciated.