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I dont understand the error message(Tile Entity)


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I always get this weird error message:

	[21:06:28] [server thread/ERROR] [FML]: A TileEntity type hnsdieter.chargeassembly.tileentity.GearBoxTileEntity has throw an exception trying to write state. It will not persist. Report this to the mod author
java.lang.RuntimeException: class hnsdieter.chargeassembly.tileentity.GearBoxTileEntity is missing a mapping! This is a bug!
at net.minecraft.tileentity.TileEntity.writeToNBT(TileEntity.java:96) ~[TileEntity.class:?]
at hnsdieter.chargeassembly.tileentity.GearBoxTileEntity.writeToNBT(GearBoxTileEntity.java:28) ~[GearBoxTileEntity.class:?]
at net.minecraft.world.chunk.storage.AnvilChunkLoader.writeChunkToNBT(AnvilChunkLoader.java:395) [AnvilChunkLoader.class:?]
at net.minecraft.world.chunk.storage.AnvilChunkLoader.saveChunk(AnvilChunkLoader.java:204) [AnvilChunkLoader.class:?]
at net.minecraft.world.gen.ChunkProviderServer.safeSaveChunk(ChunkProviderServer.java:287) [ChunkProviderServer.class:?]
at net.minecraft.world.gen.ChunkProviderServer.saveChunks(ChunkProviderServer.java:340) [ChunkProviderServer.class:?]
at net.minecraft.world.WorldServer.saveAllChunks(WorldServer.java:862) [WorldServer.class:?]
at net.minecraft.server.MinecraftServer.saveAllWorlds(MinecraftServer.java:370) [MinecraftServer.class:?]
at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:636) [MinecraftServer.class:?]
at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:118) [integratedServer.class:?]
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:485) [MinecraftServer.class:?]
at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:752) [MinecraftServer$2.class:?]


I cant figure out what it means and how to fix it, pls help me.


My Tile Entity:

package hnsdieter.chargeassembly.tileentity;

import hnsdieter.chargeassembly.energy.IJouleMachine;
import hnsdieter.chargeassembly.util.BlockUtil;
import net.minecraft.block.Block;
import net.minecraft.nbt.NBTTagCompound;
import net.minecraft.tileentity.TileEntity;
import net.minecraftforge.common.util.ForgeDirection;
import net.minecraftforge.fluids.Fluid;
import net.minecraftforge.fluids.FluidStack;
import net.minecraftforge.fluids.FluidTank;
import net.minecraftforge.fluids.FluidTankInfo;
import net.minecraftforge.fluids.IFluidHandler;

public class GearBoxTileEntity extends TileEntity implements IJouleMachine, IFluidHandler{

public int energy;
public int maxEnergy;
public int maxTransfer;

public FluidTank tank = new FluidTank(16000);

public GearBoxTileEntity(){


public void writeToNBT(NBTTagCompound nbt){
	nbt.setInteger("Energy", energy);

public void readFromNBT(NBTTagCompound nbt){

 *	Implementation of IJouleMachine 
public void generateEnergy(int amount) {


public void transferEnergy(int amount) {


public void receiveEnergy(int amount) {
	energy = energy + amount;
	if(energy > maxEnergy){
		energy = maxEnergy;
 * IFluidHandler Implementation
 * @see net.minecraftforge.fluids.IFluidHandler
public int fill(ForgeDirection from, FluidStack resource, boolean doFill) {
	return tank.fill(resource, doFill);

public FluidStack drain(ForgeDirection from, FluidStack resource, boolean doDrain) {
	if(resource == null || !resource.isFluidEqual(tank.getFluid())){
		return null;
	return tank.drain(resource.amount, doDrain);

public FluidStack drain(ForgeDirection from, int maxDrain, boolean doDrain) {
	return tank.drain(maxDrain, doDrain);

public boolean canFill(ForgeDirection from, Fluid fluid) {
	return true;

public boolean canDrain(ForgeDirection from, Fluid fluid) {
	return false;

public FluidTankInfo[] getTankInfo(ForgeDirection from) {
	return new FluidTankInfo[] {tank.getInfo()};




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