Are you running Spigot / CraftBukkit 1.7.10, and experiencing the "Invalid Book Tag" error, when opening an essentials book? Well, here it is! A fix! That's right, I have managed to fix the Invalid Book Tag error, and I thought I'd share it will all of you.
How to install.
1. Download
2. Drop in your plugins folder
3. Reload / restart your server
4. Open an essentials book