I don’t know if too many are using this script, but with the recent changes from Wanikani, the script no longer find the API key like it happened with Ultimate TimeLine Script. I have found that changing the line number 24: window.location = ‘https://www.wanikani.com/account’ to window.location = ‘WaniKani — Log in’ solves the problem because it will go to the correct part of the settings for retrieving the API.