[15:21:58 ERROR]: Could not pass event InventoryClickEvent to BedWars1058-Cosmetics v1.1.1
org.bukkit.event.EventException: null
        at org.bukkit.plugin.EventExecutor$2.execute(EventExecutor.java:72) ~[patched_1.12.2.jar:git-Paper-1620]
        at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:78) ~[patched_1.12.2.jar:git-Paper-1620]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[patched_1.12.2.jar:git-Paper-1620]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:513) ~[patched_1.12.2.jar:git-Paper-1620]
        at net.minecraft.server.v1_12_R1.PlayerConnection.a(PlayerConnection.java:2002) ~[patched_1.12.2.jar:git-Paper-1620]
        at net.minecraft.server.v1_12_R1.PacketPlayInWindowClick.a(SourceFile:33) ~[patched_1.12.2.jar:git-Paper-1620]
        at net.minecraft.server.v1_12_R1.PacketPlayInWindowClick.a(SourceFile:10) ~[patched_1.12.2.jar:git-Paper-1620]
        at net.minecraft.server.v1_12_R1.PlayerConnectionUtils.lambda$ensureMainThread$0(PlayerConnectionUtils.java:14) ~[patched_1.12.2.jar:git-Paper-1620]
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515) ~[?:?]
        at java.util.concurrent.FutureTask.run(FutureTask.java:264) ~[?:?]
        at net.minecraft.server.v1_12_R1.SystemUtils.a(SourceFile:46) ~[patched_1.12.2.jar:git-Paper-1620]
        at net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:850) ~[patched_1.12.2.jar:git-Paper-1620]
        at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:423) ~[patched_1.12.2.jar:git-Paper-1620]
        at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:774) ~[patched_1.12.2.jar:git-Paper-1620]
        at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:666) ~[patched_1.12.2.jar:git-Paper-1620]
        at java.lang.Thread.run(Thread.java:829) [?:?]
Caused by: java.lang.IllegalArgumentException: No enum constant org.bukkit.Material.OAK_LEAVES
        at java.lang.Enum.valueOf(Enum.java:240) ~[?:?]
        at org.bukkit.Material.valueOf(Material.java:71) ~[patched_1.12.2.jar:git-Paper-1620]
        at club.mher.cosmetics.nb92t4K.jr3pKdb.<init>(Unknown Source) ~[?:?]
        at club.mher.cosmetics.j$NUL$E.doIUkf_.Lwy6C04(Unknown Source) ~[?:?]
        at club.mher.cosmetics.Cf2MF_O.B1I3jlj.getIcon(Unknown Source) ~[?:?]
        at club.mher.cosmetics.t5xGZ$_.Kld5$$Y.setContents(Unknown Source) ~[?:?]
        at club.mher.cosmetics.api.menu.Menu.open(Unknown Source) ~[?:?]
        at club.mher.cosmetics.aDp_mEX.sa9VJHt.onClick(Unknown Source) ~[?:?]
        at club.mher.cosmetics.smn_336.b6PDtRm.yky5MV7(Unknown Source) ~[?:?]
        at com.destroystokyo.paper.event.executor.asm.generated.GeneratedEventExecutor110.execute(Unknown Source) ~[?:?]
        at org.bukkit.plugin.EventExecutor$2.execute(EventExecutor.java:70) ~[patched_1.12.2.jar:git-Paper-1620]
        ... 15 more