Yes, I just did what I said
Viewing post in Hakuen Studio Eli Book RPG Maker MV MZ comments
You must be doing something different. I tested it in two ways, and none of them got me into any errors:
1 - Downloaded the sample project opened it and hit playtest. No errors.
2 - Set all plugins to OFF on the plugin manager. Set EliMZ_Book to ON. Hit playtest, no errors.
You need to tell me exactly what you are doing so I can replicate the error and see what is the problem. I'm using RPG Maker MZ with the latest updates.