Forge Server crashes whenever someone uses an item that summons lightning

Here's the stuff that pops up when the server crashes:

java.lang.NoSuchMethodError: net.minecraft.entity.player.EntityPlayer.func_70614_a(DF)Lnet/minecraft/util/MovingObjectPosition;
        at com.tuom.theultimateoremod.items.tools.swords.LopalSword.func_77659_a(LopalSword.java:26) ~[LopalSword.class:?]
        at net.minecraft.item.ItemStack.func_77957_a(ItemStack.java:146) ~[add.class:?]
        at net.minecraft.server.management.ItemInWorldManager.func_73085_a(ItemInWorldManager.java:316) ~[mx.class:?]
        at net.minecraft.network.NetHandlerPlayServer.func_147346_a(NetHandlerPlayServer.java:539) ~[nh.class:?]
        at net.minecraft.network.play.client.C08PacketPlayerBlockPlacement.func_148833_a(SourceFile:60) ~[jo.class:?]
        at net.minecraft.network.play.client.C08PacketPlayerBlockPlacement.func_148833_a(SourceFile:9) ~[jo.class:?]
        at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:212) ~[ej.class:?]
        at net.minecraft.network.NetworkSystem.func_151269_c(NetworkSystem.java:165) ~[nc.class:?]
        at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:659) ~[MinecraftServer.class:?]
        at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:334) ~[lt.class:?]
        at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:547) ~[MinecraftServer.class:?]
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:396) [MinecraftServer.class:?]
        at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685) [li.class:?]

Please help me out, really annoying when someone just discovers this on the server and crashes it