As the saveUser(user) method moved from UserManager to Storage it is no longer possible to use the API from MavenCentral. The description in your API-Tutorial will also not work any more and doing it this way with the latest LuckPerms version (and the API of MavenCentral) will cause in a MethodNotFound exception.

One solution is adding the LuckPerms.jar as an libary directly and use the updated method-structure. Maybe you can fix the API and update your wiki.

Thank you :)

The wiki is correct?

Just make sure you're depending on version 4.1. This is in Maven Central too.