Frozen_Forest Errors?

[Bloodshot_pico]

Plugin version: 8.0.0 Pre-Release 4

Spigot username: Bloodshot_pico

Issue: Getting some crash about a frozen forest that it can't find or something?

"Caused by: java.lang.AssertionError: java.lang.NoSuchFieldException: FROZEN_FOREST"

Link to settings file (world-settings.json, possibly also biome settings if you have created your own): I am using default settings.

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

Thanks for the help in advance.

~Blood