08.10 18:09:04 [Server] INFO NotToBlame issued server command: /level
08.10 18:09:04 [Server] ERROR null
08.10 18:09:04 [Server] INFO org.bukkit.command.CommandException: Unhandled exception executing command 'level' in plugin PlayerLevels v1.7.3
08.10 18:09:04 [Server] INFO at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[spigot131.jar:git-Spigot-7754231-94b0980]
08.10 18:09:04 [Server] INFO at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141) ~[spigot131.jar:git-Spigot-7754231-94b0980]
08.10 18:09:04 [Server] INFO at org.bukkit.craftbukkit.v1_12_R1.CraftServer.dispatchCommand(CraftServer.java:651) ~[spigot131.jar:git-Spigot-7754231-94b0980]
08.10 18:09:04 [Server] INFO at net.minecraft.server.v1_12_R1.PlayerConnection.handleCommand(PlayerConnection.java:1392) [spigot131.jar:git-Spigot-7754231-94b0980]
08.10 18:09:04 [Server] INFO at net.minecraft.server.v1_12_R1.PlayerConnection.a(PlayerConnection.java:1227) [spigot131.jar:git-Spigot-7754231-94b0980]
08.10 18:09:04 [Server] INFO at net.minecraft.server.v1_12_R1.PacketPlayInChat.a(PacketPlayInChat.java:45) [spigot131.jar:git-Spigot-7754231-94b0980]
08.10 18:09:04 [Server] INFO at net.minecraft.server.v1_12_R1.PacketPlayInChat.a(PacketPlayInChat.java:1) [spigot131.jar:git-Spigot-7754231-94b0980]
08.10 18:09:04 [Server] INFO at net.minecraft.server.v1_12_R1.PlayerConnectionUtils$1.run(SourceFile:13) [spigot131.jar:git-Spigot-7754231-94b0980]
08.10 18:09:04 [Server] INFO at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_181]
08.10 18:09:04 [Server] INFO at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_181]
08.10 18:09:04 [Server] INFO at net.minecraft.server.v1_12_R1.SystemUtils.a(SourceFile:46) [spigot131.jar:git-Spigot-7754231-94b0980]
08.10 18:09:04 [Server] INFO at net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:748) [spigot131.jar:git-Spigot-7754231-94b0980]
08.10 18:09:04 [Server] INFO at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:406) [spigot131.jar:git-Spigot-7754231-94b0980]
08.10 18:09:04 [Server] INFO at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:679) [spigot131.jar:git-Spigot-7754231-94b0980]
08.10 18:09:04 [Server] INFO at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:577) [spigot131.jar:git-Spigot-7754231-94b0980]
08.10 18:09:04 [Server] INFO at java.lang.Thread.run(Thread.java:748) [?:1.8.0_181]
08.10 18:09:04 [Server] INFO Caused by: java.lang.IllegalArgumentException: No enum constant org.bukkit.Material.LEGACY_SKULL_ITEM
08.10 18:09:04 [Server] INFO at java.lang.Enum.valueOf(Enum.java:238) ~[?:1.8.0_181]
08.10 18:09:04 [Server] INFO at org.bukkit.Material.valueOf(Material.java:1) ~[spigot131.jar:git-Spigot-7754231-94b0980]
08.10 18:09:04 [Server] INFO at me.arkasher.playerLevel.api.API.openInventoryLevel(API.java:246) ~[?:?]
08.10 18:09:04 [Server] INFO at me.arkasher.playerLevel.commands.Level.onCommand(Level.java:23) ~[?:?]
08.10 18:09:04 [Server] INFO at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[spigot131.jar:git-Spigot-7754231-94b0980]
08.10 18:09:04 [Server] INFO ... 15 more