LEAK EpicWorldGenerator [1.8.8-1.12.2] 8.0.0-PRE-RELEASE-3

Crashing ... on 1.11, 1.12 and 1.12.2

---- EpicWorldGenerator Crash Report ----
Time: Tue Jan 09 18:41:02 CET 2018
Description: Epic world generator failed to load.

System details:
<> Spigot version = git-Spigot-596221b-9a1fc1e (MC: 1.12)
<> Plugin version = 8.0.0-PRE-RELASE-3
<> Java Version = 1.8.0_151


Plugin details:
<> GroupManager - 2.0.1-b332 - [AnjoCaido, Gabriel Couto, ElgarL]
<> EpicWorldGenerator - 8.0.0-PRE-RELASE-3 - []
<> TreeFeller - 2.4-RELEASE - []
<> Vault - 1.6.1 - [cereal, Sleaker, mung3r]
<> ProtocolLib - 4.3.0 - [dmulloy2, comphenix]
<> Essentials - 2.0.1-b569 - [Zenexer, ementalo, Aelux, Brettflan, KimKandor, snowleo, ceulemans, Xeology, KHobbits, md_5, Iaccidentally, drtshock, vemacs, SupaHam, md678685]
<> EssentialsProtect - 2.0.1-b569 - [Zenexer, ementalo, Aelux, Brettflan, KimKandor, snowleo, ceulemans, Xeology, KHobbits]
<> EssentialsChat - 2.0.1-b569 - [Zenexer, ementalo, Aelux, Brettflan, KimKandor, snowleo, ceulemans, Xeology, KHobbits, md_5, Okamosy, Iaccidentally]
<> EssentialsGeoIP - 2.0.1-b569 - [Zenexer, ementalo, Aelux, Brettflan, KimKandor, snowleo, ceulemans, Xeology]
<> EssentialsAntiBuild - 2.0.1-b569 - [Zenexer, ementalo, Aelux, Brettflan, KimKandor, snowleo, ceulemans, Xeology, KHobbits, Iaccidentally]
<> ChangeSkin - 2.4.2 - [games647, https://github.com/games647/ChangeSkin/g...ntributors]
<> EssentialsSpawn - 2.0.1-b569 - [Zenexer, ementalo, Aelux, Brettflan, KimKandor, snowleo, ceulemans, Xeology, KHobbits]
<> TitleManager - 2.0.9 - [Puharesource]
<> AuthMe - 5.4.0-b1877 - [Xephi, sgdc3, DNx5, timvisee, games647, ljacqu, Gnat008]

Error info:
<> Error message: null
<> Stack trace: ...