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[17:48:09] [Server thread/INFO]: [MythicMobs] §6------------------------------------------------
[17:48:09] [Server thread/INFO]: [MythicMobs] §b+ Loading MythicCrucible for Bukkit
[17:48:09] [Server thread/INFO]: [MythicMobs] §6------------------------------------------------
[17:48:09] [Server thread/ERROR]: Error occurred while enabling MythicCrucible v2.0.0-SNAPSHOT (Is it up to date?)
java.lang.NoSuchFieldError: CONFIG_GENERAL
	at io.lumine.mythiccrucible.config.Configuration.<clinit>(Configuration.java:24) ~[MythicCrucible-2.0.0-SNAPSHOT.jar:?]
	at io.lumine.mythiccrucible.MythicCrucible.enable(MythicCrucible.java:78) ~[MythicCrucible-2.0.0-SNAPSHOT.jar:?]
	at io.lumine.mythic.bukkit.utils.plugin.LuminePlugin.onEnable(LuminePlugin.java:86) ~[MythicMobs-5.5.1.jar:?]
	at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:281) ~[paper-api-1.20.1-R0.1-SNAPSHOT.jar:?]
	at io.papermc.paper.plugin.manager.PaperPluginInstanceManager.enablePlugin(PaperPluginInstanceManager.java:189) ~[paper-1.20.1.jar:git-Paper-196]
	at io.papermc.paper.plugin.manager.PaperPluginManagerImpl.enablePlugin(PaperPluginManagerImpl.java:104) ~[paper-1.20.1.jar:git-Paper-196]
	at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:507) ~[paper-api-1.20.1-R0.1-SNAPSHOT.jar:?]
	at org.bukkit.craftbukkit.v1_20_R1.CraftServer.enablePlugin(CraftServer.java:642) ~[paper-1.20.1.jar:git-Paper-196]
	at org.bukkit.craftbukkit.v1_20_R1.CraftServer.enablePlugins(CraftServer.java:553) ~[paper-1.20.1.jar:git-Paper-196]
	at net.minecraft.server.MinecraftServer.loadWorld0(MinecraftServer.java:635) ~[paper-1.20.1.jar:git-Paper-196]
	at net.minecraft.server.MinecraftServer.loadLevel(MinecraftServer.java:434) ~[paper-1.20.1.jar:git-Paper-196]
	at net.minecraft.server.dedicated.DedicatedServer.initServer(DedicatedServer.java:308) ~[paper-1.20.1.jar:git-Paper-196]
	at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1100) ~[paper-1.20.1.jar:git-Paper-196]
	at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:317) ~[paper-1.20.1.jar:git-Paper-196]
	at java.lang.Thread.run(Thread.java:833) ~[?:?]
[17:48:09] [Server thread/INFO]: [MythicCrucible] Disabling MythicCrucible v2.0.0-SNAPSHOT

When I put that plugin into my server and turned it on, I encountered this error. What could be the reason?

changed the description

Also experiencing this issue on new install of MythicCrucible:

• This server is running Paper version git-Paper-370 (MC: 1.20.4) (Implementing API version 1.20.4-R0.1-SNAPSHOT) (Git: 1fa48d1)
• ModelEngine 4.0.5F
• MythicMobs 5.5.1
• MythicCrucible 2.1.0-SNAPSHOT (Build 3860)

EDIT: Resolved by updating MythicMobs to 5.6.1