Problem/Bug /Give broken?

Hello, I run a Voltz server with Bukkit, and my /give is not working.

This now explains why my voters do not get items, buycraft changes ranks but does not given items, and I can't give myself items using /give, it all generates an error here: I was wondering if anyone can help me, this is a big issue for my donators, and my voters!

Code:

19.02 19:18:27 [Server] INFO Private-II: [Private-II]Volcanid
19.02 19:18:27 [Multicraft] Skipped 8 lines due to rate limit (30/s)
19.02 19:18:24 [Server] INFO at com.earth2me.essentials.Essentials.onCommand(Essentials.java:380)
19.02 19:18:24 [Server] INFO at com.earth2me.essentials.Essentials.onCommandEssentials(Essentials.java:501)
19.02 19:18:24 [Server] INFO at com.earth2me.essentials.commands.EssentialsCommand.run(EssentialsCommand.java:161)
19.02 19:18:24 [Server] INFO at com.earth2me.essentials.commands.Commandgive.run(Commandgive.java:103)
19.02 19:18:24 [Server] INFO at com.earth2me.essentials.craftbukkit.InventoryWorkaround.addOversizedItems(InventoryWorkaround.java:107)
19.02 19:18:24 [Server] INFO at com.earth2me.essentials.craftbukkit.InventoryWorkaround.firstPartial(InventoryWorkaround.java:26)
19.02 19:18:24 [Server] INFO at org.bukkit.craftbukkit.v1_5_R3.inventory.CraftInventory.getContents(CraftInventory.java:44)
19.02 19:18:24 [Server] INFO java.lang.NoSuchMethodError: net.minecraft.inventory.IInventory.getContents()[Lnet/minecraft/item/ItemStack;
19.02 19:18:24 [Server] SEVERE Command give failed:
19.02 19:18:24 [Server] INFO Giving 64 of apple to [Private-II]Volcanid.
19.02 19:18:24 [Server] INFO at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:573)
19.02 19:18:24 [Server] INFO at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:470)
19.02 19:18:24 [Server] INFO at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:573)
19.02 19:18:24 [Server] INFO at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:276)
19.02 19:18:24 [Server] INFO at net.minecraft.server.dedicated.DedicatedServer.func_71333_ah(DedicatedServer.java:314)
19.02 19:18:24 [Server] INFO at net.minecraft.command.CommandHandler.func_71556_a(CommandHandler.java:87)
19.02 19:18:24 [Server] INFO at keepcalm.mods.bukkit.forgeHandler.commands.CommandExecutor2CommandBase.func_71515_b(CommandExecutor2CommandBase.java:105)
19.02 19:18:24 [Server] INFO at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44)
19.02 19:18:24 [Server] INFO at com.earth2me.essentials.Essentials.onCommand(Essentials.java:380)
19.02 19:18:24 [Server] INFO at com.earth2me.essentials.Essentials.onCommandEssentials(Essentials.java:501)
19.02 19:18:24 [Server] INFO at com.earth2me.essentials.commands.EssentialsCommand.run(EssentialsCommand.java:161)
19.02 19:18:24 [Server] INFO at com.earth2me.essentials.commands.Commandgive.run(Commandgive.java:103)
19.02 19:18:24 [Server] INFO at com.earth2me.essentials.craftbukkit.InventoryWorkaround.addOversizedItems(InventoryWorkaround.java:107)
19.02 19:18:24 [Server] INFO at com.earth2me.essentials.craftbukkit.InventoryWorkaround.firstPartial(InventoryWorkaround.java:26)
19.02 19:18:24 [Server] INFO at org.bukkit.craftbukkit.v1_5_R3.inventory.CraftInventory.getContents(CraftInventory.java:44)
19.02 19:18:24 [Server] INFO java.lang.NoSuchMethodError: net.minecraft.inventory.IInventory.getContents()[Lnet/minecraft/item/ItemStack;
19.02 19:18:24 [Server] SEVERE Command give failed:
19.02 19:18:24 [Server] INFO Giving 64 of apple to [Private-II]Volcanid.

Kind regards, Anarchy!

 

Make sure all plugins are up to date and compatible with the version of bukkit/spigot you are running. If that doesn't fix it, make sure no plugins are interfering with each other.