09.04 09:31:06 [Server] ERROR [ACF] java.lang.IllegalStateException: Unable to save item stacks.
09.04 09:31:06 [Server] ERROR [ACF] at net.splodgebox.elitelootbox.utils.ItemSerializer.itemStackToBase64(ItemSerializer.java:187)
09.04 09:31:06 [Server] ERROR [ACF] at net.splodgebox.elitelootbox.managers.rewards.LootboxRewardManager.serialize(LootboxRewardManager.java:42)
09.04 09:31:06 [Server] ERROR [ACF] at net.splodgebox.elitelootbox.managers.rewards.LootboxRewardManager.save(LootboxRewardManager.java:33)
09.04 09:31:06 [Server] ERROR [ACF] at net.splodgebox.elitelootbox.commands.AddRewardCommand.giveLootbox(AddRewardCommand.java:57)
09.04 09:31:06 [Server] ERROR [ACF] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
09.04 09:31:06 [Server] ERROR [ACF] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
09.04 09:31:06 [Server] ERROR [ACF] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
09.04 09:31:06 [Server] ERROR [ACF] at java.lang.reflect.Method.invoke(Method.java:498)
09.04 09:31:06 [Server] ERROR [ACF] at net.splodgebox.elitelootbox.acf.RegisteredCommand.invoke(RegisteredCommand.java:152)
09.04 09:31:06 [Server] ERROR [ACF] at net.splodgebox.elitelootbox.acf.BaseCommand.executeCommand(BaseCommand.java:577)
09.04 09:31:06 [Server] ERROR [ACF] at net.splodgebox.elitelootbox.acf.BaseCommand.execute(BaseCommand.java:513)
09.04 09:31:06 [Server] ERROR [ACF] at net.splodgebox.elitelootbox.acf.RootCommand.execute(RootCommand.java:99)
09.04 09:31:06 [Server] ERROR [ACF] at net.splodgebox.elitelootbox.acf.BukkitRootCommand.execute(BukkitRootCommand.java:81)
09.04 09:31:06 [Server] ERROR [ACF] at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:143)
09.04 09:31:06 [Server] ERROR [ACF] at org.bukkit.craftbukkit.v1_8_R3.CraftServer.dispatchCommand(CraftServer.java:666)
09.04 09:31:06 [Server] ERROR [ACF] at net.minecraft.server.v1_8_R3.PlayerConnection.handleCommand(PlayerConnection.java:1177)
09.04 09:31:06 [Server] ERROR [ACF] at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:990)
09.04 09:31:06 [Server] ERROR [ACF] at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(PacketPlayInChat.java:45)
09.04 09:31:06 [Server] ERROR [ACF] at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(PacketPlayInChat.java:1)