[22:05:52 ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'serial' in plugin ItemStorage v0.0.1
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[minecraft_server.jar:git-Spigot-72c2605-251a5b6]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141) ~[minecraft_server.jar:git-Spigot-72c2605-251a5b6]
        at org.bukkit.craftbukkit.v1_10_R1.CraftServer.dispatchCommand(CraftServer.java:647) ~[minecraft_server.jar:git-Spigot-72c2605-251a5b6]
        at net.minecraft.server.v1_10_R1.PlayerConnection.handleCommand(PlayerConnection.java:1358) [minecraft_server.jar:git-Spigot-72c2605-251a5b6]
        at net.minecraft.server.v1_10_R1.PlayerConnection.a(PlayerConnection.java:1193) [minecraft_server.jar:git-Spigot-72c2605-251a5b6]
        at net.minecraft.server.v1_10_R1.PacketPlayInChat.a(PacketPlayInChat.java:45) [minecraft_server.jar:git-Spigot-72c2605-251a5b6]
        at net.minecraft.server.v1_10_R1.PacketPlayInChat.a(PacketPlayInChat.java:1) [minecraft_server.jar:git-Spigot-72c2605-251a5b6]
        at net.minecraft.server.v1_10_R1.PlayerConnectionUtils$1.run(SourceFile:13) [minecraft_server.jar:git-Spigot-72c2605-251a5b6]
        at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_121]
        at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_121]
        at net.minecraft.server.v1_10_R1.SystemUtils.a(SourceFile:45) [minecraft_server.jar:git-Spigot-72c2605-251a5b6]
        at net.minecraft.server.v1_10_R1.MinecraftServer.D(MinecraftServer.java:732) [minecraft_server.jar:git-Spigot-72c2605-251a5b6]
        at net.minecraft.server.v1_10_R1.DedicatedServer.D(DedicatedServer.java:400) [minecraft_server.jar:git-Spigot-72c2605-251a5b6]
        at net.minecraft.server.v1_10_R1.MinecraftServer.C(MinecraftServer.java:668) [minecraft_server.jar:git-Spigot-72c2605-251a5b6]
        at net.minecraft.server.v1_10_R1.MinecraftServer.run(MinecraftServer.java:567) [minecraft_server.jar:git-Spigot-72c2605-251a5b6]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_121]
Caused by: java.lang.IllegalArgumentException: Args doesn't contain type key ('==')
        at org.bukkit.configuration.serialization.ConfigurationSerialization.deserializeObject(ConfigurationSerialization.java:192) ~[minecraft_server.jar:git-Spigot-72c2605-251a5b6]
        at de.faldoria.itemstorage.ItemStorage.onCommand(ItemStorage.java:58) ~[?:?]
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[minecraft_server.jar:git-Spigot-72c2605-251a5b6]
        ... 15 more
>