Why is my GUI Crashing?

I have a gui, with a button which teleports the player.
But everytime i press the button, the game crashes.
Error:
Spoiler:
Code:
Spoiler:
package net.minecraft.src;

import java.awt.image.BufferedImage;
import org.lwjgl.opengl.GL11;

public class TARDISGui extends GuiScreen
{
	public TARDISGui()
	{
	}
   
  //Declarations:
   //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   //Text Fields
	//Name Tardis
	private GuiTextField Name;
	//Teleport X coor
	private GuiTextField TeleportX;
	//Teleport Y coor
	private GuiTextField TeleportY;
	//Teleport Z coor
	private GuiTextField TeleportZ;
   
   private String TardisText;
   //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  
	public void initGui()
	{
		controlList.clear();
	  //Buttons
	 //Name
  // controlList.add(new GuiButton(1, width / 2 + 2, height / 2 + 20, 98, 20, "Name"));
  //Teleportation
  // controlList.add(new GuiButton(2, width / 2 + 2, height / 2 + 20, 98, 20, "Teleportation"));
  //Inventory
  // controlList.add(new GuiButton(3, width / 2 + 2, height / 2 + 20, 98, 20, "Inventory"));
  //Overworld
  // controlList.add(new GuiButton(4, width / 2 + 2, height / 2 + 20, 98, 20, "Overworld"));
  //Nether
  // controlList.add(new GuiButton(5, width / 2 + 2, height / 2 + 20, 98, 20, "Nether"));
  //End
  // controlList.add(new GuiButton(6, width / 2 + 2, height / 2 + 20, 98, 20, "End"));
  //OtherWorld
  // controlList.add(new GuiButton(7, width / 2 + 2, height / 2 + 20, 98, 20, "OtherWorld"));
	 //Teleport
   controlList.add(new GuiButton(1, width / 2 + 2, height / 2 + 20, 98, 20, "Teleport"));
  //Save Current
		// controlList.add(new GuiButton(9, width / 2 + 2, height / 2 + 20, 98, 20, "Save Current"));
		//Saved Locations
		// controlList.add(new GuiButton(10, width / 2 + 2, height / 2 + 20, 98, 20, "Saved Locations"));
	}
	public void keyTyped(char c, int i)
{
  super.keyTyped(c, i);
  Name.textboxKeyTyped(c, i);
  TeleportX.textboxKeyTyped(c, i);
  TeleportY.textboxKeyTyped(c, i);
  TeleportZ.textboxKeyTyped(c, i);
}
public void mouseClicked(int i, int j, int k)
{
  super.mouseClicked(i, j, k);
  Name.mouseClicked(i, j, k);
  TeleportX.mouseClicked(i, j, k);
  TeleportY.mouseClicked(i, j, k);
  TeleportZ.mouseClicked(i, j, k);
}
   
	protected void actionPerformed(GuiButton guibutton, EntityPlayer entityplayer)
	{
	 /*
	 if(guibutton.id == 1)
		{
		
		}
  if(guibutton.id == 2)
		{
		
		}
  if(guibutton.id == 3)
		{
		
		}
  if(guibutton.id == 4)
		{
		
		}
  if(guibutton.id == 5)
		{
		
		}
  if(guibutton.id == 6)
		{
		
		}
  if(guibutton.id == 7)
		{
		
		}
		*/
		if(guibutton.id == 1)
		{
		 //ModLoader.getMinecraftInstance().theWorld.setRainStrength(5F);
		 //ModLoader.getMinecraftInstance().theWorld.setRainStrength(0F);
		 //double posX, posY, posZ;
		 //get input dimension
		 //get/set input coor.
		 //posX   = Double.parseDouble( TeleportX.getText() );
		 //posY   = Double.parseDouble( TeleportX.getText() );
		 //posZ  = Double.parseDouble( TeleportX.getText() );
		 //teleport the player
		 //entityplayer.setPosition(entityplayer.posX, entityplayer.posY, entityplayer.posZ);
		 //entityplayer.setPosition(posX + 1, posY, posZ);
		 entityplayer.setPosition(100, 100, 100);
		 //console.setPosition(posX, posY, posZ);
		 //tardis.setPosition(posX, posY, posZ);
		}
		/*
		if(guibutton.id == 9)
		{
		
		}
		if(guibutton.id == 10)
		{
		
		}
		 */
	} 
   
	public boolean doesGuiPauseGame()
	{
		return false;
	}
  
	public void onGuiClosed()
	{
  
	}
  
	public void drawScreen(int i, int j, float f)
	{
	 drawDefaultBackground();
		drawGradientRect(20, 20, width - 20, height - 20, 0x60500000, 0xa0803030);
		drawRect(60, 60, width - 60, height - 60, 0xFF0000FF);
		drawString(fontRenderer, "Rain Controller",width / 2 - 100, height / 2 - 40 , 0xCCCCCC);
		drawCenteredString(fontRenderer, "Weather Controller", width / 2, 45, 0xffffff);
		super.drawScreen(i, j, f);
	}

}
Why is my GUI Crashing?

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