You've got me. I've never seen an error like this before.
My best guess is that the code reweaver wants to get access to some stuff and the target won't permit it. Either because you've got a property or method whose scope is protected when it needs to be public or because of constraints in the new Java Module system.
The secret of how to be miserable is to constantly expect things are going to happen the way that they are "supposed" to happen.
You can have faith, which carries the understanding that you may be disappointed. Then there's being a willfully-blind idiot, which virtually guarantees it.