I don't know what I did but I know I did something that killed the plug-in. All other plugins are off, this error happens with a fresh version of the plugin as well.
A new scene to create your own characters graphics! · By
I guess the problem is you are using an outdated version of EliMZ_Book. Your screenshot is on version 5.0.0. But the current version is 5.4.12.
characterGenerator is a property of $eliData, which is the object that holds the saved contents of my plugins. On previous versions of Eli Book, the $eliData was created after the game objects. But on the current, it is created before. I guess the game is trying to access $eliData, but it has not been created yet.
Please, update your EliMZ_Book and see if the problem will be fixed. Otherwise, send me a sample project replicating the issue on the PM of the forums so I can take a look.
https://forums.rpgmakerweb.com/index.php?members/eliaquim.123037/
Thank you so much! That fixed it. I thought I was going insane, I tried a new project and everything.