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public ItemStack getHeldItem()
{
return defaultHeldItem;
}
static
{
defaultHeldItem=new ItemStack(Item.ingotIron, 1);
}
private static final ItemStack defaultHeldItem;

Quote from Westfaliaforever

Try this:
In your EntityYourmob.java add this before the last bracket:

public ItemStack getHeldItem()
{
return defaultHeldItem;
}
static
{
defaultHeldItem=new ItemStack(Item.ingotIron, 1);
}
private static final ItemStack defaultHeldItem;