[08:28:53 WARN]: [CarlTheCreeper] Reward Error - 'money': Slot already registered!
[08:28:53 WARN]: [CarlTheCreeper] Task #1123853 for CarlTheCreeper v2.6.3 generated an exception
java.lang.IllegalArgumentException: No enum constant org.bukkit.Material.342
        at java.lang.Enum.valueOf(Enum.java:238) ~[?:1.8.0_171]
        at org.bukkit.Material.valueOf(Material.java:1) ~[TacoSpigot-1.8.8-b31.jar:git-TacoSpigot-"95870a93"]
        at me.xericker.carlthecreeper.menus.menus.RewardsMenu$2.run(RewardsMenu.java:108) ~[?:?]
        at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftTask.run(CraftTask.java:59) ~[TacoSpigot-1.8.8-b31.jar:git-TacoSpigot-"95870a93"]
        at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:349) [TacoSpigot-1.8.8-b31.jar:git-TacoSpigot-"95870a93"]
        at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:785) [TacoSpigot-1.8.8-b31.jar:git-TacoSpigot-"95870a93"]
        at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:378) [TacoSpigot-1.8.8-b31.jar:git-TacoSpigot-"95870a93"]
        at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:715) [TacoSpigot-1.8.8-b31.jar:git-TacoSpigot-"95870a93"]
        at net.minecraft.server.v1_8_R3.