Mythic Mobs

>mythicmobs eggs give BumbleBeesBuster TownCaptain
[02:43:38 WARN]: Unexpected exception while parsing console command "mythicmobs eggs give BumbleBeesBuster TownCaptain"
org.bukkit.command.CommandException: Unhandled exception executing command 'mythicmobs' in plugin MythicMobs v4.4.1
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[server.jar:git-Spigot-f6a273b-0adc1b9]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141) ~[server.jar:git-Spigot-f6a273b-0adc1b9]
        at org.bukkit.craftbukkit.v1_13_R2.CraftServer.dispatchCommand(CraftServer.java:699) ~[server.jar:git-Spigot-f6a273b-0adc1b9]
        at org.bukkit.craftbukkit.v1_13_R2.CraftServer.dispatchServerCommand(CraftServer.java:684) [server.jar:git-Spigot-f6a273b-0adc1b9]
        at net.minecraft.server.v1_13_R2.DedicatedServer.aU(DedicatedServer.java:459) [server.jar:git-Spigot-f6a273b-0adc1b9]
        at net.minecraft.server.v1_13_R2.DedicatedServer.b(DedicatedServer.java:418) [server.jar:git-Spigot-f6a273b-0adc1b9]
        at net.minecraft.server.v1_13_R2.MinecraftServer.a(MinecraftServer.java:835) [server.jar:git-Spigot-f6a273b-0adc1b9]
        at net.minecraft.server.v1_13_R2.MinecraftServer.run(MinecraftServer.java:733) [server.jar:git-Spigot-f6a273b-0adc1b9]
        at java.lang.Thread.run(Thread.java:748) [?:1.8.0_181]
Caused by: java.lang.NoClassDefFoundError: Could not initialize class io.lumine.xikage.mythicmobs.volatilecode.VolatileMaterial
        at io.lumine.xikage.mythicmobs.mobs.EggManager.giveMythicEgg(EggManager.java:20) ~[?:?]
        at io.lumine.xikage.mythicmobs.commands.eggs.GiveCommand.onCommand(GiveCommand.java:60) ~[?:?]
        at io.lumine.utils.commands.Command.onCommand(Command.java:69) ~[?:?]
        at io.lumine.utils.commands.Command.onCommand(Command.java:60) ~[?:?]
        at io.lumine.utils.commands.Command.onCommand(Command.java:60) ~[?:?]
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[server.jar:git-Spigot-f6a273b-0adc1b9]
        ... 8 more