/ewg edit produces massive error

[Andrew Kelly]

Plugin version: EWG 8.0.2 (on paper-588)

Spigot username: Darkitect

Issue: /ewg edit [worldname] produces a big error and will not generate a configuration ID.

Link to settings file (world-settings.json, possibly also biome settings if you have created your own): https://pastebin.com/wCTR2yEJ

Link to error log/crash log: https://pastebin.com/taHwax8Z