I have made a custom liquid, but:

 

- When I place the flowing one down, the game crashes

- When I place the still one down, it doesn't flow, but when i change the block underneath it, the game crashes

 

Error log:

http://pastebin.com/g3aFB9KW

 

BlockStill:

package TreviModdingCrew.LiquidEnergy.block;

import TreviModdingCrew.LiquidEnergy.Main;
import net.minecraft.block.BlockStationary;
import net.minecraft.block.material.Material;
import net.minecraft.client.renderer.texture.IconRegister;
import net.minecraft.creativetab.CreativeTabs;
import net.minecraft.util.Icon;
import net.minecraftforge.liquids.ILiquid;

public class BlockEnergyLiquid_Still extends BlockStationary implements ILiquid
{
private String name;

public BlockEnergyLiquid_Still(int par1, String name)
{
	super(par1, Material.water);
    this.setHardness(100F);
    this.setLightOpacity(3);
    this.setCreativeTab(Main.liqEne_Tab);
    this.name = name;
    this.setUnlocalizedName(name);
    this.setTickRandomly(true);
}

@Override
public int getRenderType()
{
	return 4;
}

@Override
public int stillLiquidId()
{
	return this.blockID;
}

@Override
public boolean isMetaSensitive()
{
	return false;
}

@Override
public int stillLiquidMeta()
{
	return 0;
}

@Override
public void registerIcons(IconRegister iconReg)
{
	System.out.println(Main.modid + ":" + this.getUnlocalizedName());
    this.theIcon = new Icon[] { iconReg.registerIcon(Main.modid + ":" + this.name.substring(0, 12)), iconReg.registerIcon(Main.modid + ":" + this.name.substring(0, 12)) };
}
}

 

BlockFlowing:

package TreviModdingCrew.LiquidEnergy.block;

import net.minecraft.block.BlockFlowing;
import net.minecraft.block.material.Material;
import net.minecraft.client.renderer.texture.IconRegister;
import net.minecraft.creativetab.CreativeTabs;
import net.minecraft.util.Icon;
import net.minecraftforge.liquids.ILiquid;
import TreviModdingCrew.LiquidEnergy.Main;

public class BlockEnergyLiquid_Flowing extends BlockFlowing implements ILiquid
{
private String name;

public BlockEnergyLiquid_Flowing(int par1, String name)
{
	super(par1, Material.water);
    this.setHardness(100F);
    this.setLightOpacity(3);
    this.setCreativeTab(Main.liqEne_Tab);
    this.name = name;
    this.setUnlocalizedName(name);
    this.setTickRandomly(true);
}

@Override
public int getRenderType()
{
	return 4;
}

@Override
public int stillLiquidId()
{
	return Main.energyLiquid_Still.blockID;
}

@Override
public boolean isMetaSensitive()
{
	return false;
}

@Override
public int stillLiquidMeta()
{
	return 0;
}

@Override
public void registerIcons(IconRegister iconReg)
{
	System.out.println(Main.modid + ":" + this.getUnlocalizedName());
    this.theIcon = new Icon[] { iconReg.registerIcon(Main.modid + ":" + this.name.substring(0, 12)), iconReg.registerIcon(Main.modid + ":" + this.name) };
}
}

flowing liquid block needs to be one ID lower than the still block (or vice versa, I forget, search for liquid on the forum)

the flowing block id has to be one lower than the still id, also when you do

 public void registerIcons(IconRegister iconReg)
{
  System.out.println(Main.modid + ":" + this.getUnlocalizedName());
     this.theIcon = new Icon[] { iconReg.registerIcon(Main.modid + ":" + this.name.substring(0, 12)), iconReg.registerIcon(Main.modid + ":" + this.name.substring(0, 12)) };
}

change it to

 public void registerIcons(IconRegister iconReg)
{
  System.out.println(Main.modid + ":" + this.getUnlocalizedName());
     this.theIcon = new Icon[] { iconReg.registerIcon(Main.modid + ":" + this.name.substring(5)), iconReg.registerIcon(Main.modid + ":" + this.name.substring(5)) };
}