Error on load (v8 pre-release 5)

[Zakra]

Plugin version: 8.0.0-PRE-RELASE-5

Spigot username: xeradam

Issue: This is an issue that happened on load when I tried to use the latest version for 1.13, the problem is that I am using paperspigot, and my build number is 1536. I've tested it with the latest 1.13 spigot build and it didn't happened. I would appreciate if this can be fixed.

Link to settings file (world-settings.json, possibly also biome settings if you have created your own): Default configuration

Link to error log/crash log: https://pastebin.com/jAgejFNn