Code:

16:02:35 [INFO] Connection reset
    >2013-06-11 16:02:44 [INFO] [ForgeModLoader] addBukkitEntityType mmmPowersuits.e
    ntitySpinningBlade for class class org.bukkit.craftbukkit.v1_5_R2.entity.CraftPr
    ojectile with ID 13075
    16:02:52 [SEVERE] Could not pass event PlayerInteractEvent to Essentials vPre2.1
    1.1.2
    org.bukkit.event.EventException
            at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.ja
    va:363)
            at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.jav
    a:62)
            at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.j
    ava:479)
            at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.j
    ava:464)
            at org.bukkit.craftbukkit.v1_5_R2.event.CraftEventFactory.callPlayerInte
    ractEvent(CraftEventFactory.java:174)
            at net.minecraft.item.ItemInWorldManager.func_73078_a(ItemInWorldManager
    .java:541)
            at net.minecraft.network.NetServerHandler.func_72472_a(NetServerHandler.
    java:874)
            at net.minecraft.network.packet.Packet15Place.func_73279_a(SourceFile:58
    )
            at net.minecraft.network.TcpConnection.func_74428_b(TcpConnection.java:4
    42)
            at net.minecraft.network.NetServerHandler.func_72570_d(NetServerHandler.
    java:222)
            at net.minecraft.network.NetworkListenThread.func_71747_b(NetworkListenT
    hread.java:53)
            at net.minecraft.server.dedicated.DedicatedServerListenThread.func_71747
    _b(SourceFile:30)
            at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.jav
    a:860)
            at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(Dedicated
    Server.java:320)
            at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.jav
    a:729)
            at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:613)
            at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:573)
    Caused by: java.lang.IllegalArgumentException: Invalid inventory size; expected
    36 or less
            at org.bukkit.craftbukkit.v1_5_R2.inventory.CraftInventory.setContents(C
    raftInventory.java:54)
            at com.earth2me.essentials.craftbukkit.InventoryWorkaround.addAllItems(I
    nventoryWorkaround.java:40)
            at com.earth2me.essentials.Trade.pay(Trade.java:147)
            at com.earth2me.essentials.signs.SignBuy.onSignInteract(SignBuy.java:30)

            at com.earth2me.essentials.signs.EssentialsSign.onSignInteract(Essential
    sSign.java:86)
            at com.earth2me.essentials.signs.SignPlayerListener.onPlayerInteract(Sig
    nPlayerListener.java:74)
            at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
            at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
            at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
            at java.lang.reflect.Method.invoke(Unknown Source)
            at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.ja
    va:361)
            ... 16 more
    >