MCreator 1.8.2 , Forge Mod Loader version 184.108.40.20668 for Minecraft 1.12.2 .
Server crashes when loading mod.
[Server thread/ERROR] [minecraft/MinecraftServer]: Encountered an unexpected exception
at mod.mcreator.mcreator_spawnmonstersblock.<clinit>(mcreator_spawnmonstersblock.java:33) ~[mcreator_spawnmonstersblock.class:?]
at mod.mcreator.spawn_monster_tool.<clinit>(spawn_monster_tool.java:98) ~[spawn_monster_tool.class:?]
This is very simple mod including a custom block and one procedure. I had the same problem with MCreator 1.8.1. Both mods work when testing in MCreator environment on client side but when installed on the server they make it crashed. Any help ?