Error with textures!

import net.minecraft.creativetab.CreativeTabs;
import net.minecraft.entity.EntityLivingBase;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.item.Item;
import net.minecraft.item.ItemStack;

public class Launcher extends Item {

    public Launcher() {
this.setMaxStackSize(64);
this.setCreativeTab(CreativeTabs.tabMisc);
this.setUnlocalizedName("Launcher");
this.setTextureName("mainclass:pirple_sword");
    }
}